Pips · strategies
Constraints first.
Each region tells you exactly what its pip values must do. Start with the tightest constraints and the dominoes fall into place.
01
Exact-sum small regions
A 2-cell region with sum=3 can only hold certain pip pairs. Combined with the domino adjacency requirement, most resolve immediately.
02
Equal regions
An “=” region means every pip is the same value. A 4-cell equal region with a specific sum narrows to one value (e.g. sum 12 in 4 equal cells means each pip is 3).
03
Domino adjacency
Each domino covers two orthogonally adjacent cells. A cell in the corner has only 2 possible partners — if one is already placed, the other is forced.
04
Process of elimination
Place forced dominoes first, then check which remaining cells have only one valid partner left. The puzzle converges quickly once half the dominoes are down.