1 store · cheapest $2.49 · source CheapShark
This is the lowest price ever recorded for it.
All-time low $2.49 on Dec 18, 2025 · source cheapshark
Not enough observations yet. History starts the first time we see this game and grows from there — we never back-fill a price we did not record.
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Official Steam announcements for this game
Fix the description of prop 4.6 in English
Fix the description of prop 4.6 in English
last yr.
20250403 fix
Fix the bug: Rule 2.1 is wrongly showed in the tutorial when proving proposition 2.1.
last yr.
20250120 update
fix some text error add macOS version (It's better to try the demo version before buying the game)
2y ago
This is a puzzle game like a mathematical book, based on logic and deduction. In this game, you don't need to beat the level, but need to prove it is beatable. Your goal is not to win, but to prove you can win.
