King of the Monsters is a two-player (or one-player vs. computer) fighting game, in which the players take control of two gargantuan monsters and battle it out in different city locations.
The city gets gradually destroyed as the two creatures fight each other. The players can also interact with the scenery by picking up objects to use against their opponent.
Gameplay involves dodging attacks, using special moves, and trying to knock your opponent off a cliff or into the water. The game features various stages set in different cities around the world.