Setup and opening position
Twelve cells contain the digits 0 through 2. Every orthogonally adjacent pair is a candidate domino edge, and the seeded board is a relabelled or reflected form of a solver-proven unique layout.
Dominosa
Choose six candidate edges that cover all twelve cells and use every unordered digit pair once.
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How to play
Choose six candidate edges that cover all twelve cells and use every unordered digit pair once.
- Twelve cells contain the digits 0 through 2. Every orthogonally adjacent pair is a candidate domino edge, and the seeded board is a relabelled or reflected form of a solver-proven unique layout.
- Select non-overlapping adjacent cell pairs so every cell belongs to exactly one domino. The unordered pairs 0-0, 0-1, 0-2, 1-1, 1-2, and 2-2 must each appear exactly once.
- Choose six candidate edges that cover all twelve cells and use every unordered digit pair once.
Strategy tips
- Mark any candidate whose digit pair has only one remaining location, then remove all other candidates touching either of its cells.
- Pair order is irrelevant: 0-2 and 2-0 are the same domino type and cannot both be selected.
- Audit both constraints independently—six non-overlapping dominoes and six different pair types—because satisfying one does not guarantee the other.
Complete guide
Rules, scoring, and strategy
Dominosa is a complete browser implementation with its own versioned rules profile. Partition a 4×3 number grid into the six distinct domino pairs made from 0, 1, and 2.
Legal moves and game flow
Select non-overlapping adjacent cell pairs so every cell belongs to exactly one domino. The unordered pairs 0-0, 0-1, 0-2, 1-1, 1-2, and 2-2 must each appear exactly once.
Winning and terminal positions
Choose six candidate edges that cover all twelve cells and use every unordered digit pair once. Audit both constraints independently—six non-overlapping dominoes and six different pair types—because satisfying one does not guarantee the other.
Practical strategy
Mark any candidate whose digit pair has only one remaining location, then remove all other candidates touching either of its cells. Pair order is irrelevant: 0-2 and 2-0 are the same domino type and cannot both be selected.
Questions players ask
What is the objective in Dominosa?
Choose six candidate edges that cover all twelve cells and use every unordered digit pair once.
Which moves are legal in Dominosa?
Select non-overlapping adjacent cell pairs so every cell belongs to exactly one domino. The unordered pairs 0-0, 0-1, 0-2, 1-1, 1-2, and 2-2 must each appear exactly once.
What should I plan first in Dominosa?
Mark any candidate whose digit pair has only one remaining location, then remove all other candidates touching either of its cells.