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Portal 2: Community Edition coming to Steam 17 apr.
(store.steampowered.com)
For PC gaming news and discussion. PCGamingWiki
Rules:
Portal 2 already had Hammer, and even a more limited Portal 2 specific editor, for making levels. That Portal 2 specific editor is more like Mario Maker. It gives you the ability to place all the stuff that's in the game, but it's very limited in how, and I think you can only do boxy shapes.