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SpaceChem is a puzzle and simulation game developed and published by Zachtronics.

You play as a Reactor Engineer for SpaceChem, the leading chemical synthesis company serving frontier colonies. Your task is to construct automated reactors that transform raw elements into complex molecules using programmable "waldoes" that move, bond, rotate, and manipulate atoms with precision.

Each puzzle introduces new mechanics and increasingly demanding production requirements, encouraging players to think like engineers. Multiple solutions are possible, and every design can be optimized for speed, reactor size, and efficiency. The game rewards creativity and logical thinking, making it a favorite among fans of programming, automation, and optimization games.

With more than 50 challenging puzzles, Steam Workshop support, achievements, and an expansion DLC (63 Corvi), SpaceChem offers hundreds of hours of satisfying problem-solving.