The game is based on DOOM's more simple approach to gameplay with a dose of old school game design featuring score, a life-count and extra lives. The outrageous enemies come in waves, dozens at a time, ammo for the basic weapons is plentiful and action almost never ceases. Sometimes a dinosaur, various vehicles (including a flying saucer) and static guns can be mounted to lay waste to Mental's hordes. Weapons include a revolver, shotgun, circular saw, plasma gun, sniper rifle, Uzi, rocket launcher, grenade launcher, mini gun, canon and a serious bomb. The game's engine combines support for a high model count on screen at any given time with a long draw distance.