The game has several two-player modes. Players may race on foot through new (or altered) levels, have shoot-'em-up battles in mechs, hunt for Master Emerald shardsSonic Adventure 2 (Dreamcast) instruction manual, p. 23. or race in go-karts. A few characters are playable in these modes, but not in the main game; Tikal and Chaos from the original Sonic Adventure are playable in the treasure-hunting game,Sonic Adventure 2: Battle (GameCube) instruction manual, pp. 22-23. (PDF) as are Amy Rose and Metal Sonic in the foot-racing levelsSonic Adventure 2: Battle (GameCube) instruction manual, pp. 18-19. and mechs piloted by Chao and Big the Cat (replaced by a Dark Chao in Battle) in the shooting levels.Sonic Adventure 2: Battle (GameCube) instruction manual, pp. 20-21.
