alt.hn

4/4/2026 at 4:45:54 PM

Show HN: A game where you build a GPU

 https://jaso1024.com/mvidia/

by Jaso1024

4/4/2026 at 6:48:39 PM

This is great!

Some comments:

- I didn't like the "truth tables" one, I got many duplicate questions and for some reason I got only one second for the first question. The rest of the questions I managed to answer correctly but I still got only one start out of three?

- I got very confused by the capacitor. Capacitors do not have an "enable" gate! In fact, in 2.7 (1T1C) you are supposed to build the enable gate -- with a transistor. So currently, you can just simply not build the enable gate and use the one already in the primitive, meaning you don't need the NMOS gate at all.

Was this made using LLM-assistence? (Not judging, I'm just interested!) I'd love to hear more about your workflow and how you managed to produce a good UI as it's something I couldn't do if my life depended on it, and it's a skill I'd like to learn.

by rustybolt

4/4/2026 at 7:00:58 PM

Oh, I didn't notice this capacitor bug, I changed it to add an enable gate for 2.4 (for context, i created 2.4 after 2.7 b/c i thought 2.7 wasn't obvious enough for some ppl). 2.4 kind of needs the enable pin b/c of how my simulation system works. Yeah, I felt pretty conflicted on the capacitors whilst building, theres actually a note about this in the capacitor info block in later levels, but I couldn't really make a true capacitor compatible with the underlying simulation system I had built (I should have thought it through from the start).

Ill fix the truth tables bug (i think i know the issue), the stars come from playing in endless mode

I used claude quite a bit, it struggled through a lot of this (wiring and simulation systems in particular), but managed to crank this out, for the graphics i was extremely detailed in terms of what i wanted i'd say

by Jaso1024

4/4/2026 at 7:14:35 PM

Since we're in feedback mode, 2.16 has no BitLineBar reference to feed to the comparators. I had to cheese the level by connecting the "capacitor" outputs straight to the outputs, and it worked.

On the capacitor though, the capacitor level is weird as you don't build the capacitor charge system with transistors. Though I definitely get that the simulation engine is for digital stuff, not analog :)

Also a general feedback on the time-based challenges: dial them back. A lot. Most of them are just not interesting and have zero learning value. In fact, the "DRAM refresh" one just made me quit the game (clicking on 8 rows to keep them fresh). Okay, 10s is enough, I got the point. No need to hold up for a whole minute. Kinda same for the hex one. However, some of them are good, and the UI for the binary ones is great, especially for the two's complement one!

Small nitpick on the UI: some blocks don't have their connections aligned with the grid, making the wiring OCD-incompatible. But that's minor. It's a shame since the wire routing algorithm works quite well overall, and I'm impressed an LLM could produce that good of an UI!

Otherwise, quite a fun little game, if slow paced when one already knows some bits of digital logic. Keep up!

by tuetuopay

4/4/2026 at 7:26:54 PM

lol, I encountered the same thing w/ the Dram one in particular during testing (I passed it by using number keys, but probably was a sign to remove)

Thanks, I appreciate all the feedback, fixes coming in the next push

by Jaso1024

4/5/2026 at 1:25:41 AM

I'm still confused about 2.7 because it says that we have to use WL so that "the bit line (BL) connects to the storage element for reading or writing". But the accepted solution connects to the storage element only for writing, not for reading (the capacitor is always connected to the output for reading).

I would think that if you wanted to make it so that the storage element was connected either for reading or for writing by the WL and otherwise disconnected, you would need two transistors, not just one.

Perhaps this was meant to say "for writing either a 0 or a 1"?

by schoen

4/5/2026 at 9:27:34 AM

2.7 is confusing because you can wire up the bitline and the word line the wrong way around and the tests still pass.

by eterm

4/4/2026 at 9:29:03 PM

Agreed, truth tables one is important. But it's backwards, you test people on truth tables before teaching them.

If someone is seeing this for the first time they may have never seen some of those gates and you quiz them.

Then finally after passing the quiz, you define NAND and NOR and Inverter.

Swap the teaching one to be the intro to the truth tables one.

Second bit of feedback is the timer. Increase the time allotted. I know them very well and still was struggling to get all the input correct before the timer hit. Or consider possibly just eliminating the timer completely - if your goal is to be sure that they know them.

by BoiledCabbage

4/4/2026 at 10:06:25 PM

good point, made an update that added difficulty levels to the minigames (handles the timer), and i'll probably move the truth tables minigame to after the user builds the truth tables, thx

by Jaso1024

4/4/2026 at 6:59:48 PM

Anyone who likes this should also take a look at: https://store.steampowered.com/app/1444480/Turing_Complete/ At the end you have your own CPU with your own assembly language. Sadly stuck in early access since forever with some very rough edges

by txr

4/4/2026 at 7:01:34 PM

Love this game. Does anyone know if developers are still active?

by battxbox

4/4/2026 at 7:06:38 PM

Steam discussions seem to imply there is still something happening https://steamcommunity.com/app/1444480/discussions/0/7674379... But communication is definitely subpar. I completed it a few years ago, was fun but having prior knowledge about digital circuits is a must have in my opinion.

by txr

4/5/2026 at 12:06:21 AM

They're bikeshedding pretty hard, making their own language for the simulation. You can access the unstable branch through steam, it was getting fairly regular updates last I checked.

by ben-schaaf

4/5/2026 at 1:37:01 AM

is there anything interesting in the unstable branch??

also lmfao bikeshedding a custom language is EXACTLY what i would expect from the dev of that kinda nerd game. feels like a good sign tbh

by scratchyone

4/5/2026 at 11:20:55 AM

Last I checked there's some rebalancing that looks pretty good, but the real advantage from the custom language is a huge performance boost.

by ben-schaaf

4/6/2026 at 2:51:08 AM

I think its called yakshaving when you actually do it. Bikeshedding is discussing stuff that doesn't matter to avoid tlaking about the hard stuff

by whattheheckheck

4/4/2026 at 7:09:26 PM

wow - will try it today!

by Damjanski

4/7/2026 at 7:42:20 AM

After compelting almost all available levels, here is some feedback:

1) the bug report form is completely broken for me (safari on macos 26): one cannot type spaces there bc the space bar still triggers the execution steps, one cannot paste text into there, and sending the reports always fails.

2) I am now stuck on levels 2.26 and 2.37. I just cannot make sense of the instructions given there. Please clarify them.

Otherwise I really enjoyed playing the game!

all the best

by primes4all

4/4/2026 at 6:54:19 PM

I worked on deep sub-micron, full custom mixed-signal integrated circuits for more than a decade, and I can't pass the first level.

> Wire an NMOS transistor so that when In is 1, the output is pulled to ground (0). When In is 0, the output should be unconnected (Z).

Certainly:

(a) The nMOS has 3 connections: its drain is only connected to the output (no +Vdd supply), it's source is tied to ground, it's gate is tied to the signal input

(b) When the gate (input) is driven high, the nMOS transistor turns "on," connecting the output to the source (which is grounded). This acts as a "pull-down network"

(c) When the gate is driven low, the nMOS turns "off," leaving no connection to the output. This is equivalent to a "high-impedance" / "unconnected" / "Z" output

Fails 1/2 tests

(Edit) - I thought the light grey, thick line on the background grid was a wire from "input" to the transistor's gate. It is not. You need to explicitly add a wire from "input" to gate :\

by roadbuster

4/4/2026 at 7:10:17 PM

I'm a total doofus with no relevant experience and neither could I.

by mistidoi

4/4/2026 at 7:15:56 PM

Adding intro levels today!

by Jaso1024

4/5/2026 at 1:53:16 AM

I solved it but I had to use 'two' NMOS transistors unlike the direction.

Wire an NMOS transistor so that when In is 1, the output is pulled to ground (0). When In is 0, the output should be unconnected (Z).

The way it's worded it sounds like you need 'an NMOS' ie a single one? So I messed around but then I remembered seeing gates made from two transistors in my dusty memory.

(edit) I see there _is_ a one transistor solution... I'm pretty sure I tried that though. :/

by djmips

4/4/2026 at 7:07:57 PM

lol, mb. As in understand it, its that the colors of the bg make it seem like its wires when its not, I'll change the color theme a bit to fix (plz correct me if my understanding is wrong)

by Jaso1024

4/4/2026 at 7:17:44 PM

Yes, that's the issue: the (thick) solid grey "major axis" lines on the background seemed to be a wire.

If I could make a recommendation, get rid of the grid lines entirely and only have 'dots' at regular spacing. Here's what Cadence Virtuoso looks like (the most popular circuit schematic tool for integrated circuit design):

https://www.eecs.umich.edu/courses/eecs311/f09/tutorials/cad...

by roadbuster

4/4/2026 at 7:28:54 PM

Will do, thx! Coming in the next push

by Jaso1024

4/4/2026 at 11:42:25 PM

the part that tripped me up is 0 showing in deep RED and I thought that meant I was doing something wrong. I came here, read this and realized I was actually right and then pressed the Run tests button and passed. This is a UX thing you'd want to address

by dcreater

4/5/2026 at 1:50:11 AM

makes sense, ill change the color a bit in the next update

by Jaso1024

4/4/2026 at 11:03:47 PM

consider a colorblind mode that uses patterns instead of colors for those of us that are color-challenged

by varenc

4/4/2026 at 10:42:53 PM

Did you switch to software?

by brcmthrowaway

4/5/2026 at 2:58:56 AM

Yes. But, looking at BRCM/AVGO's stock chart, I may have made a mistake.

by roadbuster

4/4/2026 at 5:53:26 PM

This looks really cool, although I personally seem to lack the absolute basic knowledge that is required to make sense of the tutorial messages, so I couldn't even figure out the first level.

by Anonyneko

4/4/2026 at 5:56:07 PM

Thanks for telling me this, I actually made an act 0 that went through the basics + physics of the pmos and nmos transistors, but i scrapped it b/c i couldn't get it to look like I wanted it to, will add it back

by Jaso1024

4/4/2026 at 6:07:16 PM

Glad I'm not the only one! I love these kinds of games; played the heck out of Turing Complete and Zachtronics' Engineer of the People... But I'd never heard of 3 state logic until today.

Really threw me for a loop! I'm still trying to wrap my head around making level 3's NOT gate.

This is such a cool idea, definitely the first 3-state circuit puzzler I've seen! Throw a cute story over it and I bet this would get some takers on Steam.

by StableAlkyne

4/4/2026 at 7:21:01 PM

You need to have a, "Okay, I've tried 10 times, it's not working, what's the answer?" button. That will help not just us rubes who can't understand, but also in the off chance something is broken and even "correct" answers are being rejected.

by frmersdog

4/4/2026 at 7:23:00 PM

makes sense, adding to the next push (in the interim, u can also use the copy circuit button to ask gpt if ur correct or not), also, what level is this? (if u dont mind me asking)

by Jaso1024

4/4/2026 at 7:42:11 PM

Oh that's what the "copy circuit" button does. I have been trying to paste circuits from previous levels into subsequent ones and wondering what I was doing wrong

by sarvagyavaish

4/4/2026 at 7:58:36 PM

lol, mb; ill make that more clear (ill also give the ability to copy things cross level and intra-level)

by Jaso1024

4/4/2026 at 10:24:14 PM

Nw! This is an excellent game overall. I have always had a REALLY hard time understanding the electronics behind gates and this has been super helpful. I understood the physics behind NMOS and PMOS, and separately what logic tables represented and could be combines for higher order execution. The first few levels, constructing NANDs and NORs, has always been a puzzle - until today! Thank you <3

by sarvagyavaish

4/5/2026 at 2:51:38 AM

This reminds me of the Zachtronics game KOHCTPYKTOP (https://zachtronics.com/zach-like/). The game left me wanting more and wishing I was using an actual tool for learning or designing semiconductors circuits, rather than playing a game.

by dnotq

4/5/2026 at 6:28:20 AM

Wow, I didn't realize Zachtronics made Infiniminer. Fascinating!

by moss_dog

4/4/2026 at 5:57:52 PM

as a learning resource, it would be great it acronyms were expanded at least once. nmos, pmos, gnd, vdd all in the first 5 seconds or so, and i didnt see anywhere that actually said what those stood for

otherwise, looks polished and fills in a nice niche!

by john_strinlai

4/4/2026 at 6:13:01 PM

There's the info boxes that it could be added to, that way it is always available at a mouse click.

That said, I'm not sure how useful expanding most of the acronyms would be. Names like Negative/Positive Metal Oxide Semiconductor aren't exactly self-explanatory, Vdd isn't really an acronym, etc..

by II2II

4/4/2026 at 6:09:05 PM

I had an arc 0 where it went through some of these topics more in depth and explained them, deleted it b/c i couldn't get the UI to look right. I've pushed a bandaid that should fix this, but ill bring in arc 0 (it seems this is a popular request) after polishing it (ill also make it optional)

by Jaso1024

4/5/2026 at 3:10:32 AM

This seems really cool, haven't played it yet but I took a glance at the first two levels and it looks similar to another game I've played - will definitely play through it when I get a chance. I wanna make a GPU but my board doesn't have nearly ennough dsp units, so a virtual one like in this game will have to suffice lol

by everyos_

4/5/2026 at 9:07:47 PM

This is excellent, both educationally and from a UX standpoint! I've tried multiple times to read explanations on how transistors work and bounced off, but this time I think I've finally understood how to use them, at least practically. I feel like this is a great continuation of https://nandgame.com which taught me quite a bit about how small circuits combine to form something big (although I never finished it, I hope to finish this one at least). Another thing that I find interesting, is that while it is clearly developed primarily by AI, the result is exceptionally better than nearly every other AI-assisted project I've tried.

Some suggestions: - What I miss from NAND Game is the challenge of optimizing for efficiency. You'd build a component and it would let you know if it could be built with fewer NAND gates and you'd try to simplify the circuit. For example, while I did "NAND it" with 4 transistors, I did "The dual" with 5 and given the explanation I got afterwards I could have used one less. - This definitely needs to get better on mobile - The description for the first level using BitLine and BitLineBar (I think that was the Sense Amp?) doesn't really explain what it's supposed to do and I had to deduce it from the truth table.

by a022311

4/7/2026 at 3:08:18 AM

The text is too small to read on a phone, and pinch to zoom is disabled. That's pn the first lesson

by ____tom____

4/7/2026 at 3:10:10 AM

And after I typed this comment, I retuned to the site, and it was zoom in to the point where I could see one line of text and i could find no way to zoom back out, and all navigation was off screen.

iPhone.

by ____tom____

4/4/2026 at 8:15:50 PM

This is super cool but part of me wishes I could skip to the later levels rather than redo college homework from a decade ago. Maybe that ruins the fun but also slogging through the early levels (especially when the UI is a bit rough around the edges and doesn't support copy paste) isn't fun either.

by xmprt

4/4/2026 at 5:51:43 PM

Great game! For learning, might be nice to see some commentary or example (model) solutions after beating a level.

by npinsker

4/4/2026 at 5:54:52 PM

Yeah, I've actually been planning to add this in, might have gemini look at your circuit config and give its opinion, alongside dynamic hints

by Jaso1024

4/5/2026 at 9:01:36 AM

I was able to do the latch level (2.11) using a single OR gate. It did pass the tests, but I am not sure if what I did actually works in practice. (Force as one input, then feed the output of the OR gate into the other input) The fun fact after completing the level mentions a bistable latch (I don't know what that is) using two inverters, which I didn't use.

by PotatoShadow

4/5/2026 at 9:33:06 PM

Agreed. It should get itself into a twist with the undefined output being fed into the input and therefore the output always being undefined or 1.

Likewise, level 2.12 is a bit messed up, given you can ignore BitLineBar. I'm not sure what the intended solution was.

by mnw21cam

4/5/2026 at 6:28:07 PM

Please put the connector on the top of GND. GND goes on the bottom of a schematic.

by wren6991

4/6/2026 at 4:30:32 PM

You've got a gem in the works here, looking forward to seeing how it continues to develop! Wouldn't mind showing some support on Steam.

by wtyvn

4/4/2026 at 7:43:52 PM

Hi everyone, commenting to address feedback:

- Made timed minigames optional (e.g. binary tables)

- Added 7 (optional) intro levels to walk through pmos and nmos transistors

- Fixed the bug in the capacitor levels

- Changed editor bg to use dots instead of lines to fix wire confusion

by Jaso1024

4/4/2026 at 7:52:13 PM

Layout appears unusable on my phone on Firefox Android (both portrait and landscape). Necessary elements seem to get hidden behind others. Not sure if I'm even supposed to be able to play it without kB&m though lol :)

by sheiyei

4/4/2026 at 7:59:13 PM

Yeah, its not mobile-ready atm, ill push an update to make it mobile-friendly in the next day or so

by Jaso1024

4/4/2026 at 5:30:34 PM

This is very cool!

We need more games like this so that the younger population get some sort of exposure to the hardware side of things, before AI takes over that field. I would also think that take-home electronic and soldering kits for adults and younger folks would be another way to reduce dependance on AI.

by SilentM68

4/5/2026 at 12:39:45 PM

Really cool approach to teaching GPU architecture. The progression from basic logic gates to actual GPU components is exactly how I would want to learn this. Much better than reading datasheets.

One thing that would make it even stronger: a brief explanation panel for each level showing what real-world GPU component the puzzle maps to. When I completed the truth tables section, I wanted to know where that pattern shows up in actual silicon.

by avipilcer

4/5/2026 at 3:55:12 PM

Really glad to see this kind of game getting traction. I've been working on Hard Chip (a transistor-level CMOS circuit puzzle game) for a couple of years, and the niche is a bit lonely sometimes. Games that make low-level hardware concepts tangible seem to be finding an ever-larger audience every day. Excited to try your take on this with this one!

by Elorth

4/4/2026 at 8:38:09 PM

That was great fun, an interactive refresher on my EE studies. Thank you so much for creating it.

If anybody can create something similarly interactive, educational and hands-on for microbiology or robotics, I am happy to sponsor your cost.

by vibe_that_works

4/4/2026 at 7:25:08 PM

Reminds me of http://nandgame.com and https://nand2tetris.org

by fragmede

4/4/2026 at 7:36:57 PM

Yeah, nand game was part of the inspiration, I felt that it was good but was a bit plain UI/UX wise and obfuscated / simplified some things that it shouldn't have

by Jaso1024

4/4/2026 at 6:56:06 PM

Any easy way to make this usable on mobile? In portrait mode things are unreadable, zoom and scrolling do not work. Landscape is even worse as everything is out of view (and zoom/scroll do not work).

by zapkyeskrill

4/4/2026 at 7:02:15 PM

Yeah, i'm planning to make it mobile compatible in the coming day(s), i didn't plan for this to be mobile originally, so it kind of sucks on phone

by Jaso1024

4/5/2026 at 12:00:07 PM

Honestly it's more or less usable already - maybe matter of display size compared to other comment. One thing that is killing the fun is that it's impossible to delete something. That or even undo button would make it enough to have fun with it.

by dzikimarian

4/5/2026 at 2:25:01 AM

Please add OG/embed tags. It's both polite and helpful to let people see what they're about to land on when someone shares a link on socials/discord

by Zetaphor

4/5/2026 at 12:17:25 AM

Some feedback:

- Nice idea, though after playing Turing complete, I would like to skip the beginning and move to stuff that makes GPUs different to CPUs. But it's understandable.

- I'm not smart enough to intuit NAND from transistors. I'm also not sure I will be alone in that. It's such a weird difficulty wall.

- Speaking of, the difficulty is all over the place. Though easy mode is appreciated.

- Even with a n key rollover keyboard, I couldn't complete the capacitor refresh level. It seems like it speeds up and certain capacitors already start empty.

- The routing for wires is no good atrocious. Any level with more than 8 components will end up impossible to read.

- It doesn't help that you can't color code or even path wires manually.

- Might be Firefox only, but I had a hard time selecting the connection points.

- Dragging the mouse along the edge should pan. Otherwise you have to drop the connection and zoom.

- I appreciate the added "show solution". But it's not really giving you a solution. It's just a better hint.

- An option to show all tests or at least more tests would get great.

by dminik

4/5/2026 at 2:59:38 AM

> I'm not smart enough to intuit NAND from transistors. I'm also not sure I will be alone in that. It's such a weird difficulty wall.

I agree with you, because I feel like I only got that one because I happened to get curious about CMOS (PMOS + NMOS) logic earlier this year, and remembered the general idea from before. Otherwise, I don't think I would have figured that out either. Google image search for CMOS NAND basically shows the solution, but the game doesn't tell you that's what it is until after you beat the level. I think seeing the answer, then immediate trying to reproduce it from memory is a good way to learn. Then if you try again the next day/week/month and are still able to remember it, then you've learned it.

I also looked up a solution for the full adder since I couldn't quite remember how it worked.

Tangentially, I've gone through similar material over time repeatedly in the games nandgame and Turing Complete, going through the Nand 2 Tetris course (on Coursera), building Ben Eater's breadboard 8-bit computer, reading "Code" by Charles Petzold and "The Pattern on the Stone" by Danny Hillis and "Digital Computer Electronics" by Malvino since that was what Ben Eater partly based his computer design on, and going over digital logic in CS-related EE courses up through how a CPU is made. But most of those barely cover anything below the logic gate level and I don't think any of them covered CMOS/NMOS/PMOS specifically which is why I got curious about them this year.

It's pretty fun though (my type of fun anyway), and I'm really curious to see how the rest of it goes since it's building a GPU instead of a CPU for a change.

by drivers99

4/5/2026 at 2:00:59 AM

Fixed some of these in the update I just pushed, will fix the rest in the next update. Any thoughts on how to scale the difficulty a bit better?

by Jaso1024

4/6/2026 at 1:43:47 PM

2.20 seems ... weird?

No matter what I do, the clock line in the log stays at 1 during tests.

Also the D latches behave very weirdly.

by Arch-TK

4/5/2026 at 1:40:44 PM

Seems cool but its just not quite responsive enough on Android Firefox. It seems to almost fit, but i think things are cut off. Controls dont seem to work - i think the materials are off screen because the directions say to select materials but I dont see where to do that.

by arcbyte

4/4/2026 at 5:36:27 PM

This would be such a good game for introducing students to digital technology! This is so fun! We just had to draw them by hand back in the dark ages of the 2010s.

by buildbot

4/4/2026 at 5:45:05 PM

Thx, way better (imo) than just reading slides or (god forbid) pure text describing comp arch

by Jaso1024

4/4/2026 at 5:57:39 PM

100% agree - the way that you have the very subtle arrows on the transistor drains that show the actual current flow is really smart too. I struggled with visualizing the current flow in undergrad for an embarrassingly long time.

by buildbot

4/5/2026 at 3:29:31 PM

Well done. I enjoyed it and also found it interesting that the js was under 100k and served with br-encoding. I'm using gzip by default everywhere, but maybe should take a look at br for text-based content.

by p2detar

4/4/2026 at 7:50:24 PM

I'm confused about a difference in the NMOS and PMOS. The scenario I'm confused about is when the source is VDD and the drain is connected to GND and output.

For the PMOS, the output toggles between 1 and 0 (opposite the gate) as expected. However, for the NMOS, the output is always 0.

I don't understand why GND pulls VDD down to 0 for the NMOS, but not the PMOS.

by iandev

4/4/2026 at 8:10:41 PM

Oh, the drain should only be connected to the output, not drain aswell (irl this would kill one's chip, I'll add a feature to show short-circuiting). on pmos the source should be vdd, on nmos the source should be gnd (this doesn't apply for some later levels, but does for earlier ones).

by Jaso1024

4/5/2026 at 12:18:54 PM

it's great, i really like it! i've been working on something similar for CPUs but not getting into the EE weeds (like i don't get into DRAM at all, no voltages, no slew rates, etc, etc).

it was all reasonably easy to get until you get to the sense amplifier which has an almost complete lack of explanation of why you need the required outputs, it is "clear if already known". i.e. if you've never done any electrical engineering it makes zero sense and is not the sort of thing a software developer could ever figure out with the minimal explanation.

by tankenmate

4/5/2026 at 9:04:11 AM

Awesome! Small feedback: The test should maybe auto run. I solved the first level and was confused why I didn't proceed. The out was -1 (but goal was z) and it took me a while to see the 'run test' button.

by FrojoS

4/5/2026 at 12:52:45 AM

Your bug submission endpoint is getting a 429, so I'll report a bug here:

I see a difficulty pop up after I click "run tests" but it then gets hidden and doesn't do anything.

This was after selecting intermediate on the truth tables level, then clicking "next level" from there.

by eterm

4/4/2026 at 11:44:19 PM

Nice vibe coded project. There are a few UX holes i've encountered so far: No way to go to the next lesson if we dismiss the modal (have to go back to the tree and then click the next lesson)? more hints or step wise reveal if user gets stuck will be very helpful

by dcreater

4/5/2026 at 8:55:14 AM

I love this! I learned my first logic with Crocodile Clips: would simulate and solder a lot of D flip flop based logic before learning about microcontrollers (my first was Atmel AT90S2313)

by urba_

4/4/2026 at 9:26:52 PM

Huge fan of this! I love learning-by-doing and this captures that cycle perfectly.

by brynnbee

4/4/2026 at 6:26:56 PM

This is awesome! The truth table lightning round took me by surprise, I am rustier than I thought...

One note: It isn't immediately obvious that the In/Out nodes can be connected to multiple wires, made the first few rounds harder to work thru.

by fleshers

4/4/2026 at 6:42:55 PM

I see, thx, ill add a note in the game to make it more clear

by Jaso1024

4/4/2026 at 7:40:30 PM

truth tables round is optional now!

by Jaso1024

4/4/2026 at 7:17:12 PM

A nice game, though the truth table lighting round is pretty punishing! Big contrast to the circuit building part where you can take your time. Personally I'd drop the time requirements from that quiz section.

by gchadwick

4/4/2026 at 7:36:00 PM

Yeah, a lot of people have said similar things, I'm going to make them all optional (coming in 30 min or so)

by Jaso1024

4/4/2026 at 7:31:10 PM

if you solve a level, then press "next level", then solve that next level - then it still shows the original level (I think it just gets hidden below the new one and then reappears after a solve?)

by NooneAtAll3

4/4/2026 at 8:05:34 PM

just pushed a fix

by Jaso1024

4/4/2026 at 11:30:34 PM

I have been looking for something like this for so longggg! THANK YOU

by Liebmann5

4/4/2026 at 8:18:06 PM

The truth tables are way too hard for me. I need time to think and the 10 seconds is way too fast. If this is intended to be a teaching resource, avoid timers IMHO. It needlessly excludes people.

by unsnap_biceps

4/4/2026 at 8:22:28 PM

makes sense, idk if i want to remove times altogether (i personally found it fun + i want the game to be fun for all levels of familiarity), but ill add a modal to explicitly select difficulty level at the start of the racer game, i def agree w/ u overall

by Jaso1024

4/4/2026 at 9:58:35 PM

please just let me skip it. why am i doing homework in the middle of a game?

by testaccount28

4/5/2026 at 1:53:27 AM

lol, i made them skippable earlier to day, if u refresh now it should let you skip them

by Jaso1024

4/7/2026 at 3:22:24 AM

thanks boss!

by testaccount28

4/4/2026 at 11:40:08 PM

I would have really liked to have a temporary node to test the outputs. Better than that, I would have liked to see the truth table update in real time without running the tests.

by rg2004

4/4/2026 at 7:17:29 PM

Is this a sequel to "How to make a CPU"? https://www.youtube.com/watch?v=vuvckBQ1bME

by baobabKoodaa

4/4/2026 at 8:01:05 PM

lol, I hadn't seen that video before but its a good one. Na, this is the guide to comp arch that will (hopefully) end all instances of toil over documentation for any sort of processor when learning

by Jaso1024

4/4/2026 at 8:00:20 PM

The 2.13 level ("hex racer") is kind of pain. Apparently I'm not fast enough at dividing/multiplying by 16... when I get something like "convert 0xB3 to decimal"

by xnzakg

4/4/2026 at 8:11:39 PM

Time to get on zetamac (all jokes aside, it should be optional, i'll also make racer games slower + adaptive soon (today))

by Jaso1024

4/5/2026 at 10:20:31 AM

+ for the idea

- for the load javascript from that page imposes on CPU. +15 °C in less than 30 seconds. Nothing on the page could justify that.

by Insimwytim

4/5/2026 at 8:52:27 PM

Yeah, my old MacBook got really laggy and the fans were spinning hard. Still worth it!

by a022311

4/5/2026 at 1:46:15 PM

Reminds me of that one data center game on steam. I love how we're gamifying learning on these levels now

by nc1zdev

4/4/2026 at 5:57:06 PM

It's always nice to see educational games like that. A lot of new learners (like me) are just looking at the high level stuff, where the computer "just works"...

Well done and keep it up :)

by Ginop

4/5/2026 at 6:30:38 AM

I am a huge sucker for games/lessons like this. I feel like I've played one every 5 years for the last almost 25 years.

by msully4321

4/5/2026 at 8:59:15 AM

This is amazing. There are a few quirks here and there, but the idea is great and it's super fun to play around in.

by BuildItBusk

4/4/2026 at 5:46:38 PM

Love it, thanks! Would you mind making it possible for me to see my "circuit" after running the tests? Currently, I can't go back to the circuit I created.

by schlecht_

4/4/2026 at 5:48:14 PM

Sure, you should be able to rn though, is this after completing the level (wanna fix this bug)?

by Jaso1024

4/4/2026 at 5:56:14 PM

Sure, but I can't seem to find the git?

by schlecht_

4/4/2026 at 6:00:11 PM

I haven't pushed to github (Will do this soon), but I believe that i've fixed the issue (also, by wanna fix this bug I meant I want to fix this bug, (but would def also appreciate help if ur interested, the mechanics of this game ended up being a bit more complex than I initially envisioned lol))

by Jaso1024

4/4/2026 at 6:02:54 PM

No problem. I am currently on the third level I think and my laptop fan ramps up, so I closed the tab and it stopped. Also, how can I delete e.g. transistors again?

by schlecht_

4/4/2026 at 6:07:23 PM

I see, I'll try to reduce the load, i'm using canvas 2d so that could be causing it. you can delete by selecting then pressing the delete button (will also allow right click to delete in the next push, since i do this for wires)

by Jaso1024

4/4/2026 at 5:57:15 PM

Fixed!

by Jaso1024

4/4/2026 at 5:19:31 PM

Awesome project! Reminds me of Turing Complete on Steam.

by arikrahman

4/4/2026 at 5:45:52 PM

Yeah, that was the inspiration, felt that it didn't go in depth enough + didn't cover other processors, so I wanted to fill that hole + make it free

by Jaso1024

4/4/2026 at 8:27:51 PM

The aspect that I especially like is covering the 3-state aspect of the logic. Studying CS, it was kind of vaguely mentioned, and we skipped over to doing logic diagrams with gates and the assumption of 2-state logic really quickly...and it seems like most games do that kind of skip too. Working at the transistor level grounds it better to the actual components.

by khedoros1

4/5/2026 at 2:00:24 PM

I really like the game as a concept, and I got pretty far already, level 2.16, but I feel like some levels aren't making much sense at all in terms of the goal and how the passing circuit fulfills the objective. The Latch and some others had me puzzled. Because it is clearly vibecoded I feel like I cannot really trust the educational material all that much and at times it's not clear if I am misundestanding something or if is just nonsensical LLM slop.

by dauertewigkeit

4/5/2026 at 4:33:05 AM

It is really interesting. No authentication to save the level so that you can continue next time.

by ampedcast

4/4/2026 at 6:52:05 PM

The continue buttons in intro break for me all the time on Firefox. I can't actually finish most of them.

by jmholla

4/4/2026 at 7:53:48 PM

fixed!

by Jaso1024

4/4/2026 at 8:42:35 PM

I've made it through about the first ten parts of section 2. Some additional feedback I've put together:

* Sometimes explanations are overly lacking, other times they get repetitive. This feels like it needs to be accompanied by a course to fully deliver value. For instance, we're kind of thrown into truth gates without having really gone over them. And understanding how to combine NMOS and PMOS gates could use a better intro. Once I knew the answers, I got my brain to reset to my VLSI course from college, but I think a better primer could've accomplished that. In other places, I feel like we get more refreshers on some components than others.

* The routing algorithm needs to be better. I get a lot of staircase wires and straight up overlaps.

* Right clicking should clear attempted connections.

* There should be away to delete components you've placed. Maybe I just couldn't figure it out.

* I think icons should be included on the components pane. I kept clicking NOR when I wanted NOT and a better visual cue would have helped.

* It feels like difficulty is all over the place. Perhaps this is corrected with better explanations, but creating the NAND gates and NOR gates were much more difficult compared to AND and OR. Perhaps actually having us construct those gates without NOT would change the difficulty curve.

* The success overlay shows up too fast. Especially on levels that are just a demonstration (like the NMOS and PMOS Again levels) you don't get to to see everything the level is trying to demonstrate before the level announces that you have succeeded.

* In the intros, when there are new components, their description pops in. Instead, it should just advance like a slide. It's very jarring.

* Also, it's unclear that those aren't part of the intro. Maybe instead of popping them up, flash the little information icon next to them.

* What you call a capacitor I believe is actually a combination of a transistor and a capacitor. I think people will be hard pressed to find documentation on a capacitor with an enable switch. But, then you use this same capacitor to form a 1T1C cell. I'm rather confused.

* Many times when I finished a level, the circuit would switch to a prior level's solution.

* Some components have the same letters for every terminal (e.g. half-adders), meaning you need to scroll over the terminals to know what they do.

* Some levels have many test cases, and there's now way to see them all.

* Level 2.3 talks about us having registers, but we never covered those. In fact, I think we're still a ways away since we need to get from switches to flip-flops then to registers.

There isn't much order to this. Just what I recorded while working through it. Overall it's pretty good, I just think polish would got quite a ways.

Thank you for sharing this! I'm really excited to get to the more GPU specific parts. I basically did this for CPUs in college and I'm excited to see what preconception and missing conceptions I have for GPUs.

by jmholla

4/4/2026 at 9:45:57 PM

Thanks for all the feedback! I've fixed some of these issues (e.g., capacitor levels, switching back to prior levels upon finishing / refreshing, deletion (theres a sign when you hover a component now)), but many of them i'll be fixing today.

I'll be uploading arcs 3 and 4 soon (which will be programming the CPU and the start of GPU arch soon (people have gone through arcs 1 and 2 slightly faster than I expected)

by Jaso1024

4/4/2026 at 7:46:13 PM

The “next level” button takes you to the next level even if you haven’t solved that level’s prerequisites.

by anderskaseorg

4/4/2026 at 7:53:38 PM

Thanks for telling me, just pushed a fix

by Jaso1024

4/4/2026 at 5:46:31 PM

Fun. 2.2 loads a blank screen for me, all previous levels were fine and 2.3 loads. Windows, Firefox 149.

Edit: Confirmed fixed.

by Falell

4/4/2026 at 5:52:01 PM

Fixed! If you go to the level and refresh (might need to hard refresh: Ctrl + Shift + R) it should load properly now

by Jaso1024

4/5/2026 at 12:08:24 PM

Great concept! Multi language support maybe good for spreading.

by unvalley

4/4/2026 at 8:48:39 PM

Soooo cool! I will keep try this

by kongchu2

4/4/2026 at 8:49:26 PM

love it, some level (full adder with 8 inputs) where a bit repetative, but it is fun.

by K0IN

4/4/2026 at 10:08:08 PM

yeah, I felt that when playing myself, do u think this level is not necessary given previous levels? (it would also help me if u indicated ur level of familiarity w/ the concepts s.t i can calibrate)

by Jaso1024

4/5/2026 at 9:22:56 AM

I think it's nice, but maybe just use 4 bit inputs to cut a bit on the repetitiveness.

Im a software dev, so not that much hardware experience

by K0IN

4/4/2026 at 5:35:38 PM

Great project! I somehow missed whole cpu architecture topic, so gonna catch up on that now

by agrishin

4/4/2026 at 5:44:28 PM

Yeah, fortunately I made cpu arch part of the game, so it'll serve great for that as well

by Jaso1024

4/5/2026 at 12:42:13 PM

Awesome! But too difficult for a beginner like me

by DullJZ

4/4/2026 at 10:07:35 PM

first level is impossible to solve for me! Hint or showing solution did not work! Also adding multiple sources or ground behave differently than connecting to the same.

by jomoho

4/4/2026 at 10:24:14 PM

Next update has warnings about bus contention (multiple things into one node) when its an issue, and will have a proper show solution button.

For level 1.1 the solution is basically to take the ground and use that as a singular input to the source pin of an nmos transistor, let the input to the level be the gate pin of that same nmos transistor, and to let the drain (top) pin of that nmos transistor connect to the level's output

by Jaso1024

4/5/2026 at 1:07:41 AM

is there any source or game like this specializing to create microcontroller, like arduino, wemos (not the IC), what kind of protocol is supposed to use.

by triilman

4/5/2026 at 1:52:45 AM

not to my knowledge, but i'd consider adding this in (i'm planning to extend to TPUs and apple silicon NPUs later, so i might just add this in aswell). what would one want the levels to look like?

by Jaso1024

4/4/2026 at 9:18:18 PM

Must be missing something - is there a way to save progress?

by oytis

4/4/2026 at 9:37:45 PM

progress is saved automatically, what issue are you encountering?

by Jaso1024

4/5/2026 at 10:40:46 AM

None yet, will try to remember not to clear cookies :) Sometimes games that don't maintain user accounts let you save progress in a file and restore it later, so that it survives loss of browser state, see e.g. https://microcorruption.com/

Thank you for the game by the way! It's nice to recall my asic classes, and looking forward to GPU specific chapters.

by oytis

4/5/2026 at 6:56:18 PM

Oh, no, now I actually lost part of my progress. Apparently has something to do with multiple tabs open.

by oytis

4/5/2026 at 8:32:16 AM

Bro. I'm obsessed with this. I spent a good 2-2.5 hours on a trot with this. This was one of those things I always wanted to learn a lot about and this was just perfect for that. It wasn't that easy, I really struggled and gave up on some levels but came back and struggled through them. The HexRacer type levels are difficult and I wish I could skip through those.

Also when you give a solution, you probably need an explanation of why that works.

Can't wait till you add the additional coming soon levels.

Your feedback feature seems broken. I tried giving feedback about some basic bugs and it kept saying can't send message.

Please also add a waitlist to notify when you release the additional levels.

by slake

4/5/2026 at 10:06:53 AM

I adore this genre, and if you enjoy this submission I'd recommend the following games:

    NANDgame ( Free! https://nandgame.com/ )
    Silicon Zeroes ( https://store.steampowered.com/app/684270/Silicon_Zeroes/ )
    Turing Complete ( https://store.steampowered.com/app/1444480/Turing_Complete/ )
    Human Resource Machine / 7 Billion Humans ( https://store.steampowered.com/app/792100/7_Billion_Humans/ )
    MHRD ( https://store.steampowered.com/app/576030/MHRD/ )
They're all slightly different in terms how the construction of a computer is pitched, none of them are perfect, they all have quirks and flaws, but they're all fun.

Some like Human Resource Machine take the approachof

I wish Turing Complete wasn't quite so buggy or awkward, for a while it was by far the most promising of the bunch, but it's never quite polished and it's ended up in a bit of frustrating state.

Notable mention also to The Signal State, Shenzhen I/O, and TIS100 which are higher level than this, but scratch a similar itch.

there's ones like TIS100 which I keep meaning to revisit, but I find it very difficult to get back into these games without starting from scratch, and resetting my TIS100 progress is too intimidating.

by eterm

4/4/2026 at 7:51:50 PM

So, is there anything about GPU's in here right now?

I didn't actually finish Act 2, but it seems to end in a conventional processor with the GPU first coming after another two acts currently under construction.

by joha4270

4/4/2026 at 8:06:17 PM

Not at the moment unfortunately, I've actually completed a good chunk of the GPU levels, but I think ppl will need to do act 2 and 3 for it to make sense

by Jaso1024

4/4/2026 at 6:22:33 PM

I like the concept! What tools did you use to build it?

by treelover

4/4/2026 at 6:52:51 PM

stack was mainly vite (react) + typescript pretty much (canvas 2d for the visuals)

by Jaso1024

4/4/2026 at 11:05:46 PM

Ok you have put a lot of work in this and it looks impressive. But it needs a serious balance change. It is far too hard. Currently this may work as a brain teaser for people in the industry or people with computer engineering degrees, but it wont bring any fresh young minds into the industry. The fresh young minds will be scared off.

Teaching is challenging stuff. You have to step out of your current mindset and think with the mind of someone that sees this stuff for the first time. It is not easy to make things look easy and simple. Specifically, I think you need a lot more exploration about cmos logic, about how one side pulls the output up or the other side pulls the output down but they are never on at the same time, about how they effectively amplify the result so the output does not have to depend on the power of the input, etc. Perhaps you can try to have people design things in NMOS logic than in PMOS logic and then combine the two to make a CMOS design to see how they complement each other.

But I do not want to discourage you. This is a very promising start and you should continue if you have the time.

Also, the timed answers -- are you kidding me? The time is waaay too short. And you fail all if you fail a single answer. Oh what is 0xDE in decimal, all I have to do is multiply 16 by 13 and add 14 to that. In my head in 12 seconds. Also the time is not sufficient for filling out truth tables, especially with a laptop trackpad. I was able to pass the truth tables, but gave up on hexracing.

Ok and here are some more specific issues.

-The wires seem to snap in position in a way that they superimpose each other so it becomes very difficult to see what your circuit is doing.

- truth tables seem to be bugged. If you have more inputs than the gate whose truth table you are looking at, sometimes it will generate a fictitious truth table with extra inputs. Thus, some times i get a NOT truth table that has two inputs.

- the ground element should have its connection circle on the top, not the bottom. I realized that you can rotate by pressing R, but the site does not mention that anywhere.

by hristov

4/5/2026 at 1:58:35 AM

lol, yeah, the time should be fixed though rn I think? depending on what level of difficulty you select in the racer game. The wiring is something I've been struggling with, working on making it better.

I intentionally made it s.t the truth tables are based on not just the input into the node, but based on all actual inputs to the node (so if you have additional processing on input x and y, itll show you the not w/ respect to input x and y and not just the immediate input).

will add a rotating cue in the next update

by Jaso1024

4/5/2026 at 2:50:38 AM

Yes the timing is fixed. Appreciate the quick changes. Good luck!

by hristov

4/4/2026 at 5:58:56 PM

Cool concept, but it should be mobile friendly

by tithos

4/4/2026 at 6:05:47 PM

Good point (I didn't really consider this), might be a bit difficult tho tbh, but i'll push this soon

by Jaso1024

4/4/2026 at 5:12:53 PM

În a few years it will be the only way to explain the kids what a GPU is. Unless you work for an “AI” shop and sneak them into the data center.

by nottorp

4/4/2026 at 5:30:56 PM

Exactly :(

by SilentM68

4/4/2026 at 7:39:22 PM

truth table minigame is lmost unplayable in dark mode

also it kept showing the same table to me like 4 times

by NooneAtAll3

4/4/2026 at 7:50:02 PM

I just pushed a fix for this, so it should be better now, its also optional now

by Jaso1024

4/4/2026 at 7:45:23 PM

level 1.10 I put 2 AND gates and only one of them works...

by NooneAtAll3

4/4/2026 at 7:49:32 PM

I want to fix this, could you elaborate a bit (would help even more if you pressed the copy circuit and pasted the result here)

by Jaso1024

4/4/2026 at 8:08:26 PM

Add 2 AND gates, 1 NOT gate

G0 = D0 AND SEL

G1 = NOT SEL

G2 = D1 AND G1

G0 -> Ans

G2 -> Ans

by NooneAtAll3

4/4/2026 at 10:09:55 PM

oh its b/c of the contention between the outputs of the ands for the answer, u need an or gate to merge them (ill add an update w/ visual feedback for these sorts of thigns)

by Jaso1024

4/4/2026 at 8:32:18 PM

It's likely you are pulling one to ground somehow. That was a common bug I faced.

by luyu_wu

4/4/2026 at 8:46:46 PM

really fun :) thanks!

by lukebechtel

4/5/2026 at 6:31:43 PM

i was too clever by half and tried to make a NAND gate by combining an AND gate with an inverter. after about 15 minutes i realized that i had it backwards, an AND gate is actually a NAND gate combined with an inverter

by thescriptkiddie

4/5/2026 at 7:37:00 AM

not able to get it to work on mobile

by xyst

4/4/2026 at 7:27:08 PM

how do I remove/delete elements?

by NooneAtAll3

4/4/2026 at 7:29:35 PM

click and press delete, realizing this wasn't obvious, a fix to add a similar delete mechanism to how wires are deleted is coming

by Jaso1024

4/4/2026 at 7:46:20 PM

> press delete

I don't see any button labeled that

by NooneAtAll3

4/4/2026 at 7:50:25 PM

oh, as in delete on the keyboard. it shoudl also work just to right click now (might need to refresh)

by Jaso1024

4/4/2026 at 6:13:38 PM

wow looks really cool, although seems kinda useless at first look.

by skyskys

4/4/2026 at 7:37:39 PM

damn :(

by Jaso1024

4/6/2026 at 1:41:35 PM

I will finally be able to create my own GPU lol

by Raccreative

4/4/2026 at 7:52:15 PM

...why capacitor has 3 pins ?

by PunchyHamster

4/4/2026 at 8:02:28 PM

Yeah, I had added it to make it compatible w/ my simulation system, just changed how I was handling the levels altogether, if it still has 3 try doing a hard refresh (Ctrl + Shift + R on windows, cmd + shift + R on macos)

by Jaso1024

4/6/2026 at 1:53:49 AM

I loved this! I played for straight up 2 hours now!

I wish I could get into hardware chip level jobs, I was a wiz in logic gates back in university but for jobs been primarily in systems and embedded, sure you work sometimes on rtos or fpga, but it’s another thing where your whole job is designing that! Unfortunately the jobs in hardware feels like a cult, and they expect you working on some industry specific software that you can’t do/access to unless you are in the industry to start with, kinda a catch 22 situation.

by tamimio

4/4/2026 at 6:57:26 PM

not playing past the truth tables bs

by testaccount28

4/4/2026 at 7:39:31 PM

optional now!

by Jaso1024

4/4/2026 at 7:37:24 PM

lol (plz come back), will be optional in 30 min (lemme push)

by Jaso1024

4/5/2026 at 2:12:03 PM

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by devnotes77

4/4/2026 at 7:31:20 PM

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4/5/2026 at 6:08:06 AM

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4/6/2026 at 1:33:15 AM

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4/5/2026 at 9:21:56 AM

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4/5/2026 at 9:18:02 AM

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4/6/2026 at 12:18:43 PM

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4/5/2026 at 4:33:00 PM

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4/4/2026 at 7:11:31 PM

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4/4/2026 at 4:53:21 PM

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4/4/2026 at 7:05:17 PM

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by aritzdf

4/4/2026 at 7:11:13 PM

i didn't launch on product hunt

by Jaso1024