Deductum
Wait Chip's verdict · US updated 8 hr. ago Good game, but it sits 100% of the way from its all-time low to full price. It drops harder in seasonal sales. Patience pays.
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About this game
What this game is, in the developer's words
Minimalistic puzzle game where you build formal logical proofs.
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!
Media
Trailers and screenshots straight from the store page
Price intelligence
Accepted price history and the lows that matter
Deductum price history and best deals
Deductum for PC currently sells from $4.99 at authorized stores. Its all-time low is $1.24, set on 2026-06-27.
Frequently asked questions
Answered from this game's own price and edition data