Try this ! : Sliding block puzzle (Taken from quzzle )

The above diagram shows a 4x5 size board covered by blocks of different sizes . The idea is to move the blocks (in the same plane , obviously ) so that finally the 2x2 square comes to bottom right corner .

Write a computer program to solve this (or to prove that it is unsolvable).


You can try it out right here !!

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References :

Quzzle