Sonic Adventure (1998) was extended into a GameCube and PC version that later became a part of PlayStation Network and Xbox Live known as Sonic Adventure DX (2003).
The DX version of the Dreamcast icon allowed missions throughout Station Square and Mystic Ruins, which adds more replay value. If all the emblems are collected in the remake, a Metal Sonic skin for Sonic can be unlocked.
The original GameCube and PC versions of the remake can make players play all twelve retro Sonic the Hedgehog games from the Sega Game Gear.
While it never addressed any major issues from the original game, the update sure looks better and feels better.
DX is a great upgrade for a great Sonic game.