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Valve has announced the beta release of a set of authoring tools for Portal 2, allowing users to create their own puzzles and challenges in the name of science. "The Portal 2 Authoring Tools include versions of the same tools we used to make Portal 2. They'll allow you to create your own singleplayer and co-op maps, new character skins, 3D models, sound effects, and music." The tools are available for free to anyone who owns the PC version of the game.