This game was probably the one game that when I played it (Gamecube, never was fortunate enough to have a Dreamcast) I remember it fleshing out the world of Mobius for me so much as I got to see the world that Sonic and the other Mobians live in. But what I loved most of all was the story and how they really gave characters like Shadow and Eggman so much character growth and also allowed you to explore the dynamics between Knuckles and Rouge in the search for Chaos Emeralds. I also remember trying to play levels over and over again trying to find the secrets in it like the gear you can wear and so on. And I think I also spent Hundreds of hours in the Chao Garden trying to get all the different Chao.