Halo Custom Edition is a new version of HaloPC that is free for all HaloPC owners. This unsupported version of HaloPC is a stand alone Gearbox Software release and is not supported by Microsoft. HaloCE was created as a way for Gearbox to introduce a bunch of new features to HaloPC. The most important of which is the ability to play user created content. HaloCE will feature a set of tools, tutorials and source art, a powerful package which will allow users to create their own custom content for HaloCE. You can read all about on the Gearbox Forum..