About Slide 15
Slide 15 is the classic sliding tile puzzle, invented in the 1870s and still one of the best brain teasers there is. The tiles are jumbled, and there is one gap. Slide tiles into the gap until the numbers are back in order, 1, 2, 3 along the top and so on, with the gap at the end.
There are 36 puzzles on three board sizes: 8 tiles, 15 tiles and 24 tiles. A computer worked out the fewest moves for every puzzle, and matching that number wins 3 stars. Each tile is coloured by the row it belongs in, and tiles that are home get a white edge.
The best way to solve it is one row at a time: finish the top row, then the left column, and the puzzle gets smaller each time. It builds patience and planning ahead. On the small boards the best numbers were checked against every one of the 181,440 possible positions.
Best for ages 7+
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