Objective
Cover every usable square with dominoes. Transparent squares are holes and cannot be covered. When the board is full, every region badge must be satisfied.
Domino placement
- Each domino covers 2 adjacent squares (up, down, left, or right).
- No overlaps: a square can belong to only one domino.
- No holes: dominoes cannot cover the transparent squares.
- Rotate to change orientation: click a tile in the rack to switch between horizontal and vertical.
- Undo anytime: click a placed domino to return it to the rack.
Region badges
The board is divided into colored regions. Each region has a badge showing a rule about the pips in that region (a blank side counts as 0).
= All squares in the region show the same pip number.
≠ All pip numbers in the region are different (no repeats).
Σ=12 The sum of all pips in the region equals the number.
Σ<12 The sum of all pips in the region is less than the number (Σ> works the same way).
Badges are neutral while a region is incomplete. When every square in the region is filled, the badge shows whether the rule is satisfied.
Controls
- Drag & drop a domino from the rack onto the board.
- Click a rack domino to rotate it.
- Click a placed domino to take it back.