Score
0
Time
90s
Best
—
Two-colour logic puzzle (Binairo). Fill the grid so no three of one colour sit in a row, each line is half and half, and no two lines are identical. Solve as many as you can in 90 seconds.
Tap an empty cell to colour it; tap again to switch to the other colour, and once more to clear it.
Three rules govern every solved grid. No more than two of the same colour may sit next to each other in any row or column. Each row and each column must hold an equal number of both colours. And no two rows may be identical, nor any two columns.
A cell glows red the moment it breaks a rule — three in a row, too many of one colour, or a duplicated line — so you always know where the trouble is.
Fill the grid correctly to score, and a fresh puzzle appears at once. Solve as many as you can before the clock runs out.
Three identical neighbours are forbidden, so the most reliable opening move is to look for two of the same colour already touching. The cells on both ends of that pair must be the opposite colour, and filling them in often starts a chain that fills half a line for free.
The balance rule is just as sharp a tool. Once a row already holds three of one colour, every remaining empty cell in that row must be the other colour — no thinking required. Count along each line as you work and you will frequently complete it the instant the third of a colour goes down.
Watch for the gap pattern, where two of the same colour sit with exactly one empty cell between them. That middle cell cannot match, because filling it would make three in a row, so it is forced to the opposite colour. Spotting these sandwiched gaps is the fastest source of certain moves.
The uniqueness rule rarely comes up until a grid is nearly full, but it breaks the occasional deadlock: if two rows would become identical, one of the still-empty cells must flip. In the timed mode, lean on the first two techniques for speed and keep the harder uniqueness logic in reserve for the puzzles that genuinely need it.