Remember Doom II map 20 called "Gotcha!"? Where are Cyberdemon and Spiderdemon can infight each other and also kill player. Now get ready to kill those bastards every minute...
For Cooperative mode. Singleplayer is harder than in GZDoom because Zandronum fails to understand "+DOHARMSPECIES". Also deleted "CHECKTARGET" actions...
GZDoom version of this mod. Added mini-fix. Don't try to run it in Zandronum.