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.
Slide the grid squares around so that the numbers end up in
consecutive order from the top left corner.
Click on the arrows at the edges of the grid to move a row or column
left, right, up or down. The square that falls off the end of the
row comes back on the other end.
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