 A "Game Of the Year Edition" of "Left 4 Dead" was released on the PC and Xbox 360 on May 12, 2009, with updates and new content included on the disc.On May 15, 2009, an open beta test for the Source Development Kit updated to support "Left 4 Dead" was started under the name of the "Left 4 Dead Authoring tools".This included a new set of plugins that allowed for users to import data from SketchUp, a free 3D modeling program, directly into the Hammer level editor for use in maps.