The puzzle consists of three different colored rows to three squares each. Three blue tiles are on the three red squares, three red tiles are on the three blue squares, two white tiles are in two white squares, one white square is empty. Move one tile to the empty square, if it is next to it. The shape of the tiles show you, how to move them. Some can only be moved diagonally, others only straightly.
The point of the puzzle is to bring all tiles to squares of their color. This means, the red tiles must be on the red squares at end. More than 200 different startup variations supply your brain for a long time.
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