What is Takuzu?
Takuzu is the widely-used Japanese-style name for the binary grid puzzle known in Belgium as Binairo, in Germany and Switzerland as Binoxxo, and generically as the binary puzzle. Whatever the name, the game is identical: fill an even grid with 0s and 1s so no three identical digits touch in a line, every row and column carries an equal count of each digit, and no two rows or columns repeat.
Takuzu rewards rhythm. Strong players sweep the board in passes — cap the pairs, fill the sandwiches, count the lines — and only slow down for the last stretch, where completion analysis and the unique-lines rule finish the job.
Every Takuzu board here is generated with a strict grader: the easy tier never needs more than the starter techniques, and the hard tier genuinely requires duplicate-line elimination. Nothing ever comes down to a guess.
Play Takuzu at every size
The classic Takuzu experience starts at 6×6 and 8×8 — quick boards you can finish with your coffee. From 10×10 the puzzle changes character: deductions chain across multiple lines, and the biggest 14×14 boards are proper long-form solves.
There's a new shared daily board every midnight US Eastern, a permanent archive of every past daily, and 600 unlimited boards across all five sizes and three difficulty tiers — free in any browser, with local streaks and best times.