Vault 11 is going to be a modification for Half-Life 2 made by Valve. It will be based in the Fallout universe. I am personally a huge fan of Fallout 3. I'm not making this game in YoYo Games Game Maker for two reasons. First off, I want to try to make a game with Source SDK, the open source part of HL2. And second, I want it to have next-gen graphics.