Binary Grid

Binary Grid — also known as a binary puzzle or Takuzu — uses only two symbols. Fill every cell with 0 or 1 so that each row and column has as many 0s as 1s, no line has three identical digits next to each other, and no two rows (and no two columns) are identical. Some cells start filled; every puzzle has exactly one solution reachable by logic.

1. Tap an empty cell to cycle it: blank → 0 → 1 → blank (right-click goes back).
2. Each row and column must contain the same number of 0s and 1s.
3. Never three 0s or three 1s in a row, across or down.
4. No two rows may be identical, and no two columns.

• Pairs force their neighbours. Two 1s side by side mean the cells either side must be 0.
• Gaps force the middle. 1 _ 1 means the gap is 0.
• Count. Once a row has half its 1s, the remaining cells are 0.