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For a 40x40 directional brush, you'd want a 120x120 image. These options can be combined to make an animated directional brush, like "kuroneko" (black cat) or the squirrel. (The cat has two frames, the squirrel has three.)
The next version of Tux Paint will include a modern game-like interface, with locked features that you gain by completing quests! Can you open up all of the Magic Tools!? How many colors will you find!?