from Simon Tatham's Portable Puzzle Collection
doesn't provide a feature that the puzzle code requires (such as
These puzzles have been successfully run in Firefox 19, Chrome 26,
Internet Explorer 10 and Safari 6.
Tile the rectangle with dominoes (1×2 rectangles) so that
every possible domino appears exactly once (that is, every possible
pair of numbers, including doubles).
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.
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(last modified on Wed Jun 5 01:47:27 2013)