The slide Fifteen puzzle or 15 puzzle is a very well known puzzle,include 15 wood squares numbered 1 to 15 are placed in a 5x5 try leaving one position open.
The goal is to reposition the square from a given starting configuration to the configuration shown in the picture (all numbers in order).
This puzzle has a long history you can find many math theory on the web on solving it.
Dimensions: 12.5 x 12.5 x 1.5 cm
Difficulty: 2 out of 5
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