Play Binary Puzzle (Takuzu) free online. Fill the grid with two colours — no three in a row, balanced lines, no repeats. Every puzzle has one unique logical solution.
Tap a cell to cycle blue, orange, then empty. No three same colours in a line, equal colours per row and column, and no two rows or columns alike.
Binary Puzzle — also known as Takuzu or Binairo — is a clean little logic game played on a grid of two colours. A handful of cells start filled as clues, and your job is to colour the rest so the whole grid obeys three simple rules. There's no luck and no guessing required: every puzzle has exactly one solution that pure reasoning can reach.
The three rules are easy to learn and surprisingly deep to juggle. No three cells of the same colour may sit next to each other in a row or column; each row and each column must end up with an equal number of both colours; and no two rows may be identical, nor any two columns. Those constraints feed into one another, so a single placement on one side of the board can ripple into a forced move on the other.
It runs instantly in your browser on phone, tablet or desktop — no download, no sign-up, completely free. Tap a cell to cycle blue, orange, then empty; rule-breaking cells are outlined in red as you go, so you always know where a mistake crept in. Each puzzle is freshly generated with a guaranteed unique solution, your board is saved automatically, and a new one is one tap away. A calm, satisfying brain-teaser for a spare minute or a long sit.
Tap an empty cell to make it blue, tap again for orange, and again to clear it. Fill every cell so that no three of one colour are adjacent in a line, each row and column has equal colours, and no two rows or columns match. Locked clue cells (marked with a dot) can't be changed.
Three rules: (1) never three of the same colour in a row or column; (2) each row and each column has the same number of both colours; (3) no two rows are identical and no two columns are identical.
Yes, and exactly one. Each board is generated and then checked by a solver to confirm it has a single unique solution reachable by logic alone — you never have to guess.
They mark cells that currently break a rule — usually three of the same colour in a line, or a row/column with too many of one colour. Clear or change those cells to get back on track.
Yes — your board is stored in your browser after every move, so you can close the tab and continue the same puzzle later on the same device. The Start button reads 'Continue' when a saved puzzle exists.
Completely free, with no install or sign-up, and built mobile-first with large, tap-to-cycle cells and a grid that fits any screen.