Sonic Adventure was originally released on the Dreamcast in 1999. For everyone else, Sonic Adventure definitely has its moments, and some aspects of the game have held up reasonably well over the years, but it still has its fair share of problems, ranging from an unstable frame rate to some inconsistent collision detection. Unfortunately, if you've already played the Dreamcast version, these extras definitely aren't worth your money. Sonic Adventure DX is essentially a port of the original Sonic Adventure, which launched alongside the Dreamcast in September 1999, but Sonic Team has thrown in a few extras to entice those who played the Dreamcast version and to extend the replay value of the game as a whole.
