As has been noted in a few topics, now, there's a fair amount of people who are perturbed over what's been done to the Doom 2 IWAD, with its censoring and butchery of the secret levels, level incompatibilities with multiplayer, and so on and so forth.
Fear not! A blessing from the community has arisen! A patch for bringing the BFG IWADS back into their old 1.9 selves, and it can be found here.
Though I'm pretty sure you're screwed if you have the console editions.
http://www.doomworld.com/vb/wads-mods/61818-doom-3-bfg-edition-iwad-patches/
I'll quote the relevant part of the post.
I've created two patches for the Ultimate Doom and Doom 2 1.9 IWADs for you to use if you'd like to check out the most up to date versions of the WADs included in the BFG edition. NERVE.WAD is NOT included, this only applies to the originals.
http://www.mediafire.com/?99r01xj4ie7o7bj
And lastly, a set of patches that decensors the red crosses and Wolfenstein materials for the BFG edition versions of the IWADs.
http://www.mediafire.com/?yqzw4727pzjpkj8
http://www.mediafire.com/?99r01xj4ie7o7bj
And lastly, a set of patches that decensors the red crosses and Wolfenstein materials for the BFG edition versions of the IWADs.
http://www.mediafire.com/?yqzw4727pzjpkj8
There's also this. http://user.cs.tu-berlin.de/~phenex/IWadPatcher/
As this is just a patch and not a complete IWAD, it requires the BFG IWADs or the old 1.9 IWADs to function, as it can patch them either way. The 1.9 IWADS will work with the BFG Edition's exe too, last I recall.
Happy hunting. I think I hear the cries of a thousand exaggerated stylized blue-suited Nazis already...it is a delightful sound. :3