In King of Monster Island, players take on the role of giant Monsters who must fight together to take down a titanic Boss before the latter can complete the construction of an interdimensional portal.
On each turn, players roll the dice to slap, heal, gain energy to buy cards, move around the island, find support or grab a bit of glory. The Boss, on the other hand, is managed by the game. Depending on the result of the dice rolled in the volcano, he moves, activates his Minions and attacks nearby Monsters. His goal? To enable his Minions to erect the Pylons needed to build the portal.
To win, players must defeat the Boss. If the Boss manages to activate his portal, or get rid of one of the players’ Monsters, the Earth will be lost for good!