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'Sliding Puzzle' printed from http://nrich.maths.org/
This puzzle is an old favourite. The aim of the game is to slide
the green square from its starting position, in the top right hand
corner, to the bottom left hand corner in the least number of
moves. You may only slide squares up, down, left or right and not
Try first on a small two by two grid and then as you become more
confident, alter the size.
Can you find a strategy?
This text is usually replaced by the Flash movie.
You may like to have a look at the problem
for some helpful hints.