After the Crazy Wizard and the Princess escaped from the Dragon's lair, they entered the dominion of the Goblin King, seeing its usefulness the Goblin King requested the services of the Crazy Wizard in order to expand his riches. 

But now the sapphires that the Goblin King held in one of his treasure rooms have been stolen! It's your mission to recover them and in doing so explore mysterious dungeons full of monsters, treasure and secrets that will expand your power.

Treasures of the Goblin King is a sequel to Opaloid Kingdom.