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 This is the classic '15-puzzle' that every kid has enjoyed at some point. I know I played with it endlessly as a child.
There are 16 squares, and 15 numbered tiles. The one empty tile allows you to slide in another tile from the sides orthagonally, rearranging the tiles from their initial randomized state until they count from 1 in the upper left to 15 at the end of the bottom row. Demo: Play now Author: Ivan Vieru
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