Puzzle rules
Domino Puzzles
Divide the number grid into horizontal or vertical dominoes so every cell belongs to exactly one domino. Each domino from the required set must appear exactly once, and dominoes cannot overlap.
How to solve
Complete rules
Goal: Find every domino boundary in the number grid. Rules: - Each domino covers two orthogonally adjacent cells. - Every grid cell belongs to exactly one domino. - Dominoes cannot overlap. - Each unordered number pair in the required domino set must be used exactly once.