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In this minimalistic puzzle game, you're given a set of premises and a conclusion, and your task is to use the fundamental rules of logic to formally prove, step by step, that the conclusion follows.

Tutorials introduce you to the world of proofs and the game mechanics. The early problems are simple, but the difficulty gradually increases until eventually you might not even know where to begin. Still, every problem has a solution, and if you think deeply enough, you'll never need to guess!

• Simple controls. No timers. No distractions. Just logic.

• 111 problems to solve, including classic theorems like De Morgan's Laws and the Law of the Excluded Middle

• Sandbox mode: enter any claim (with proposition symbols A–H) and see if you can prove it!