Angel of Angels
Just like a regular Angel weapon restriction game, except you can choose which weapon or weapon class you wish to restrict yourself to (any at all). The catch is that all enemies also use the weapon you use. For example, if you choose regular shotguns, or the shotgun class as in AoSh, every single enemy uses the regular shotgun/the shotgun class (i suppose they could be randomly distributed, or distributed according to hierachy IE former humans get regular shotgun, mancubi get power-modded assault shotguns) as well. Yes, even the lost souls, barons of hell, Cyberdemons and what have you.