Binary Puzzle

Fill every square with a 0 or a 1 so that:

• no more than two equal digits sit next to each other in a row or column (no 000 or 111);
• every row and every column has the same number of 0s and 1s;
• no two rows are identical, and no two columns are identical.

Controls

Tap a square to cycle empty → 0 → 1 → empty. With the keyboard, move with the arrow keys and press 0 or 1 (Space cycles, Delete clears). Undo/Redo, Hint, Check and Pause are under the grid; breaking a rule highlights the squares in red (toggle in ⚙ Settings).

Tips

Look for pairs: next to 00 there must be a 1 on both sides. A gap between two equal digits (0_0) must be the opposite digit. When a row already has half of its 0s, all its remaining squares are 1s. Sizes 6×6 to 12×12, each with exactly one solution.