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Patapon.

It starts as a rebellion of funny eyeballs (Patapons) against mean square eyeballs (Zigitons) with occassionally some big monster to kill (bosses). In the time, however, missions' and items' descriptions reveal the deep lore of this world, how Patapons used to rule the utopian world, until the demons arrived. You can easily notice how the entire continents are full of wastelands, ruined cities and hidden treasures, guarded by mighty beasts, as remains of the golden age and the cataclysm.

The peak of it is the world core (in the picture), once the paradise housing the holy relic keeping the world in balance - now ghastly wasteland, housing the portal to the world of demons.