Takuzu

How to play

Also known as Binairo. Fill the grid with 0s and 1s so every row and column holds an equal number of each, never has three of the same digit in a row, and no two rows or columns end up identical to each other.

Rules

  • Click a cell to cycle it through empty, 0, 1 and back to empty.
  • Every row and column must end up with an equal count of 0s and 1s.
  • Never place three of the same digit in a row, horizontally or vertically.
  • No two rows may be identical, and no two columns may be identical — a red cell means one of these rules is currently broken.

Tips

A pair like 0,0 next to each other forces the cell on either side to be 1 — otherwise you'd make three in a row — and once a line already has half its digits as one value, every remaining cell in it must be the other.