Play a 12x12 Very hard Binary Puzzle

This board is generated from a replayable seed and checked for one valid solution before it reaches your screen.

53%open cells with verified logic

Practice puzzle12x12 Very hard

0:0047% filled

Tap a cell to cycle it, or use arrow keys with 0, 1, Backspace, and Delete.

Balance every lineEach row and column uses the same number of 0s and 1s.

Never make threeThree matching values cannot touch in a horizontal or vertical run.

Keep lines uniqueNo completed row or column can repeat another line.

How to approach Very hard at 12x12

Start with no-three patterns, count both values, then compare the valid line patterns. Return to simple rules after every new entry.

Clues68 fixed cells start this board.

DepthThe hardest expected rule is contradiction.

Proof90 unique-solution checks shaped the puzzle.