The grid contains all 28 unique dominoes (0–0 to 6–6).
- →Click a number and then an adjacent number to pair them as a domino tile.
- →Each tile type (e.g. 3|5) may appear exactly once in the solution.
- →Use Block mode to mark edges where you know a tile cannot be placed.
Tip: Start with number pairs that only appear adjacent to each other in one place.