Takuzu
Binary logic, graded by the technique each board actually needs.
A daily binary-logic puzzle. Fill a grid with two symbols under three rules: never three alike in a row, equal counts per line, and no two identical lines. Difficulty is labelled by the deepest technique a board really requires, not a vague star rating. Offline, five languages, colorblind-safe.
Key Features
What makes Takuzu great
Difficulty named, not starred
Dawn, Day, Dusk and Night name the deepest technique a board needs — computed by the same solver that proves the board unique.
Shape as well as colour
The two symbols always differ in shape, at every cell size. A game about telling two things apart never relies on colour alone.
A free, reconstructible archive
Every past day replays from its seed. Nothing is locked behind a subscription, because nothing needs to be stored to begin with.
Ready to try Takuzu?
Binary logic, graded by the technique each board actually needs.