72%Strong matchSpaceChem
95%3k95% positive reviews, Overwhelmingly Positive across 3k reviews·Puzzle · Difficult
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Photochemistry is a challenging 2D puzzle game about synthesizing chemicals to sustain plant life in a post-apocalyptic setting. Design and construct elaborate mechanisms to produce complex compounds from simple particles.
You stand amidst the ruins of war. The world is running out of nutrients and it's your job to make them. Design. Build. Execute. Restore the world to what it once was. Uncover the truths of your own past.

No solution is predetermined. Utilize your own creativity and critical thinking to invent a mechanism that has never been made before.
Every robot has a creator. What were you really designed for? What comes next?
Unlock new parts which increase the number of ways you can express your creativity and make the most challenging levels manageable.

— 20+ levels to test your problem solving skills — Optional levels to test your limits — 3 different acts each with their own unique environment and puzzle elements — A built in recorder to share your solutions as a .gif — Create your own stages with a built in level editor
Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.
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