Pick a domino from the left board, then tap a gold-outlined cell on the right board to place it.
Columns build downwards, one column at a time. Only the next empty cell in a column can be filled.
First row: the domino must contain one of the two goals. Goals are a pool for any column. A goal is shown in the first row itself: an empty first-row cell shows the goals faintly, and a filled first-row domino shows its goal as its dark gold top number.
Targets are shown above each column. Each column has its own target.
Middle rows (rows 2 to 6): the domino must contain either number of the domino directly above it in the same column. It flips automatically so the matching number is on top.
Bottom row (row 7): target only. The domino must contain that column's target, which flips to the bottom. It does not need to match row 6.
Tapping an illegal right-board cell places nothing and clears your selection. You must select the domino again.
Used dominoes stay on the left board, greyed out, and cannot be tapped again.
Win by filling all 28 cells. Lose when no remaining domino can go in any column's next cell.
Reset returns to the start sequence: goals roll, then targets roll, then the left board fills.