shithub: puzzles

ref: 4752c7a2d9bd83d41d418b31b931a9bb9af219fa
dir: /html/dominosa.html/

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Dominosa
<p>
Tile the rectangle with dominoes (1&times;2 rectangles) so that
every possible domino appears exactly once (that is, every possible
pair of numbers, including doubles).
<p>
Click between two adjacent numbers to place or remove a domino.
Right-click to place a line between numbers if you think a domino
definitely cannot go there. Dominoes light up red if two identical
ones appear on the grid.