You start off in the world of Gaia as a fish. You will come across many tests of survival and you can only move forward. To move back is the opposite of Evolution. All in all this game is pretty addictive and fun. As you can see below though the used game cartridges are quite pricey. I think Nintendo should re-release this game in one of their current consoles so everyone would be able to enjoy it. I'll leave the link to a rom download for anyone who wants to test it out. E.V.O Search for Eden Rom Link.