An open-ended engineering game about building factories to turn raw materials into chemicals.
Here's an excerpt from SpaceChem's Steam description:
Zachtronics is back with an ambitious new design-based puzzle game. Take on the role of a Reactor Engineer working for SpaceChem, the leading chemical synthesizer for frontier colonies. Construct elaborate factories to transform raw materials into valuable chemical products! Streamline your designs to meet production quotas and survive encounters with the sinister threats that plague SpaceChem.
Pure puzzler
No timing or dexterity
No randomness during problem solving
Grid-based
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