In King of Monster Island, players will find themselves in the role of giant monsters who must work together to defeat a titanic Boss before he finishes building an interdimensional portal. At each turn, players will roll dice to damage other monsters, heal themselves, get energy and buy cards, move around the island, activate human support and increase fame. As for the Boss's actions, they are controlled entirely by the game itself. Using the results of the dice rolled into the volcano, the Boss will move, activate his henchmen and attack nearby monsters. His goal: to allow his henchmen to prepare the pylons necessary for the construction of the portal. To win, players must defeat the Boss before he can activate the portal or defeat even a single Monster. Otherwise Terra will be annihilated!