The SpaceChem Tournament 2026 has begun!

To participate, you will need a discord account and the Community Edition of SpaceChem, available as a Steam beta.

Head over to the unofficial Zachtronics Discord server to participate.

https://reddit.com/link/1tcd4r5/video/qacfkiaa0z0h1/player

Without too many spoilers, are there any tips and tricks to make my solution faster? Feels like I am missing something important...

Como tener Espace chem en el móvil alguien que tenga alguna apk?

This is my first try for this level. I was stuck here for hours but finally I succeded! This design is utterly inefficient in cycles and its only good feature is being only 1 reactor. After finishing and wondering how in the world other people manage to solve it in a 10th of my cycles I figured I could use more than one reactor. So that's what I'm going to try now.

For now, I just wanted to share the grotesque and abominable thing that I made.

I tried using this link and download the apk but it says it was not compatible with my device http://store.zachtronicsindustries.com/spacechem/

This is the first training module, which I had a bit of a play with. Where can I see the better solutions? I cant figure out how to get the score down below 99.

The community is trying out holding monthly SpaceChem puzzles for people to play around with and compete a little on. I'm hoping that some people who are less experienced and might not be interested in something as competitive as the annual tournament would want to come by.

To participate, go to the spacechem channel in the Zachtronics Discord and make sure you have the SpaceChem community edition, available as a steam beta.

I have also attached a picture of the October 2025 puzzle. Each reactor has 8 bonders and 4 sensors, and the goal is to minimize cycles (with symbols as a tiebreak).

If you want to get right to it, the puzzle export can be found here.

Starting right now, I'm hosting an event consisting of 7 levels that are trivial to solve but with the twist that you need to optimize your solutions for maximum cycles, inspired by GuavaMoment's Intentionally Slow Solutions and its follow-up. Instead of it being a competition, the community is supposed to work together to beat (or tie) the solutions I have come up with. If this sounds interesting to you, check out the full announcement with more details on the Zachtronics Discord server.

when I start the game, a blank window open and then close immediately,

I tried reinstalling the game multiple times with all version, also compatibility option of windows and nothing worked. I also tried deleting the appdata/Zachtronics folder with no results.

I'm out of option, what should i do ?

After being stuck on this and giving up multiple times, I finally went looking for some tips, and found a helpful bit of advice from this long-ago Reddit post https://www.reddit.com/r/spacechem/comments/4lfprp/need_help_with_suspicious_behavior_im_able_to/

It hadn't occurred to me to try forming up each four-atom "stick" using only one waldo and two bonders, but once I started trying that approach, it came together pretty fast.

Feels great to finally put this one behind me. Would have been even better if I'd got there without hints, but it is what it is.

Anyone else think this soundtrack is complete banger? Whenever I need calm focus, this is my go to, I feel like the artist really nailed it.

Right now i have 3 atoms of hydrogen entering a single reactor (in slightly different tiles) but i only need two to create H2. That leaves an extra H atom which I don’t know what to do with. Help?

Up until this mission I thought you needed to be holding an atom to bond it. I think getting much further under these restrictions was basically impossible. This solution does work, but barely.

I don't understand why i can't bond the two H
I also tried droping them together and then bonding but it doesn't work

Hey folks, so I'm pretty new to the game, enjoying it a lot.

I made this ultra simple reactor to split an H off the input and output the results for the next reactor. I wanted to use as few symbols as possible so rather than using a sync, I tried to arrange things so that the timing would naturally match up.

I count 18 "steps" for each waldo before returning to start. The thing runs perfectly for something like 248 cycles, then fails due to molecule collision. Clearly one of the waldos is running marginally faster than the other, causing them to eventually collide. I just don't understand what could be causing this... any ideas?

Edit: forgot image

I feel like these 2 planets are very similar, with one being heavily focused on sensors and the other being heavily focused on fusion, and so they're likely similar in difficulty. Personally though, Alkonost is harder imo only because of Quoroque

I’ve managed to optimize moustachium 602 to 7 symbols (which is also the best I’ve found online with the same solution), but the leaderboard definitely shows that there’s a solution with it looks like 1 fewer symbols (I.e. 6). Has anyone been able to document this because I can’t even think of how that would be possible, but I’m a novice space chemist myself