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 it out. The players can also interact with the scenery by picking up boats and such, to use as weapons against the other player.
Gameplay involves using a variety of attacks and special moves, as well as collecting power-ups to gain an advantage over your opponent. The goal is simple: destroy your opponent's monster before yours is destroyed.