Program two factory robots to create molecules from atoms.
Windows XP, Windows Vista, Windows 7
Mac OS X (10.5 and above, Intel only)
Ubuntu (10.04 and above, via Debian package)
Linux (via manual install)
Spacechem was created by Zach Barth. Who also made Infiniminer, which is the game Minecraft was based off of. He also made other programming games such as Infinifactory
and The Codex of Alchemical Engineering