you still need the .wad (was it .wad?) which is not free software.
You are right: WAD is not free software... because it is not software at all. It means "Where's All the Data?" and indeed contains data: sprites, levels, and other game data. Many free software people (including myself) consider that the only essential freedom when it comes to "Art data" is the freedom to redistribute exact copies. Not being allowed to modify this content is not essential (as it is for software) because you do not achieve a work with non-functional data.
