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This product is also called Tiny Skweeks in Europe.
The Brainies is a puzzle game, in which you have to guide a varying number of Brainies of four different colors onto a spot that matches their color. The challenge lies in the fact that you can only control the direction in which a Brainy will walk. After that, he will continue to walk until he hits a wall, an obstacle or another Brainy. To make things a bit more complicated, there are various obstacles like arrows that change the direction a Brainy is walking in, items than can be picked up optionally and a (often very strict) time limit.