Sonic Adventure 2 is a platform game developed by Sonic Team USA and published by Sega in 2001 as a part of the Sonic the Hedgehog series.
There is an update called Sonic Adventure 2 Battle. This version of Sonic Adventure 2 was released on December 20, 2001 in Japan, February 12, 2002 in North America, and on the GameCube's launch (May 3, 2002) in Europe.
This game is also the first Sonic the Hedgehog game on a Nintendo system, having been released ten days before Sonic Advance in Japan.
[source:wikipedia]