You can now play Doom inside Doom. Technically it's a mod for GZDoom, which is a variant of ZDoom. Both are source ports of the original code to allow mods to be built and it's still a work in progress, but it's pretty impressive already. In addition to Doom, it also allows you to play Wolfenstein 3D within Doom. Here's a further explanation of ZDoom, which also supports … [Read more...]