If you own a Sega Dreamcast and do not own Sonic Adventure then your system is not complete. This game is truly amazing. It displays the power of the Dreamcast and delivers nothing but pure solid fun. It is unlike any of the older Sonic games (which by the way were pretty hard). Not only do you play as Sonic and other characters, but you get to play minigames and raise your own virtual pet. A must have for all Dreamcast owners.