Cubivore: Survival of the Fittest(2002)

Eat or be eaten! Assume the role of an animal in it's early stages of evolutionary development. As your animal instincts take over, you will boldly traverse hostile environments, savagely stalking your prey to assert your place in the animal chain of power. Will you have what it takes to become the new king of beasts? The game started development on the Nintendo 64, but went unreleased, being later ported to the Nintendo GameCube. A prototype of the Nintendo 64 version has been found.