This game was the first Sonic game to use Time travel, they scrapped the idea on Mega Drive. Shown with fab Sonic anime cartoons, Sonic has to rescue Amy Rose from the clutches of Metallix, Eggman's newest creation to help eradicate Sonic and the world. But instead of trying to conquer the world the old fashioned way, Eggman has to be cheeky and use time travel. Consequently, Sonic must stop this also, and now he has to travel back in time, make GOOD futures in the levels, collect Time Stones to help defeat Eggman, and rescue Amy. OK. Maybe this is sliiiightly confusing...