Play Dominosa domino pairing puzzles

Pair the numbers into a set of unique dominoes. Tap two adjacent cells in turn to pair them. Cover the entire board without repeating a number pair.

How to play

1. Tap two orthogonally adjacent numbered cells in turn, or drag from one to its neighbor, to place a domino.
2. Each cell belongs to only one domino. Number pairs cannot repeat, even in the reverse order.
3. Cover every cell to pass; tap a placed domino again to remove it and try another pairing.

Logic

• Binary Balance — Find the balance hidden between zero and one.
• Skyscraper View — Use clues around the edge to deduce tower heights.
• Arithmetic Cages — Solve arithmetic and grid logic together.