CarnEvil

Blast your way out of a haunted house, midway, or freakshow while fighting a slew of amusement park/horror style enemies using only your wits, your cunning, a shotgun with acid, a flamethrower, and machinegun powerups. Gun through a variety of gruesomely creative bosses, including a giant mutated baby, and a large club wielding Santa Claus, all while being heckled by an evil floating clown head.

Very addictive game play. Very very violent, in a cartoony sort of way.