Kivi's Underworld is a casual, hack and slash game. Explore the mysterious underworld as a mighty Warrior battling opponents toe to toe, rain down fire on your enemies with the dangerous Fire Mage, sneak disguised with stealth to confound your foes as a Scout, unleash the fury of the Berserker, or adventure with any of the other sixteen playable characters. It all starts after a mining expedition, led by Kivi (a young lumen warrior), ventured into unknown territory, and opened a pathway to a deadly race. Dark elves decimated them. Kivi is the lone survivor, yet no one believes him about the new threat, since dark elves are just a myth. Kivi was there; he saw. The dark elves are real and his people are in great danger. Reluctantly, Kivi realizes that it is up to him.

Playing as Kivi or any of his companions, you leave the safety of the protected, underground cities to rebuild the lost city of Defiance, recruit more lumen to your cause, and defeat this growing dark elf threat, before they destroy your homeland and all of your kind. The fate of the lumen is in your hands. Can you save the lumen people?

Although very easy to learn, mastering Kivi's Underworld is a different matter. With a fast pace, twenty playable characters, tons of powerups, many monsters using unique tactics and skills, numerous deadly traps, and multiple difficulty levels, even an expert player will be challenged.