Monster Party is an action platformer video game for the Nintendo Entertainment System (NES) developed by Bandai, released in 1989. The game follows Mark, a regular boy who's enlisted by a winged creature called Bert to save his world from monstrous beings. The gameplay consists of three main elements: exploring various levels, battling an array of unique bosses, and solving audacious puzzles. The game is notable for its bizarre and often humorous enemy and level designs, including levels that morph from bright and cheerful to dark and moody. It's renowned for its mixture of horror themes with cartoonish style.