Sonic Advance 2

Sonic Advance 2is a side-scrolling platform game in the Sonic the Hedgehog series, developed by Dimps and published by THQ for the Game Boy Advance. The game was released in Japan on December 19, 2002, in North America on March 10, 2003, in Europe on March 18, 2003. It is based on a modified version of Sonic Advances game engine. Basic gameplay is an improvement on Sonic Advance, with much of the earlier features intact. Compared to its predecessor, Sonic Advance 2 is faster, contains more and larger level designs, is more challenging, has a faster paced sound track, and offers better control over the playable characters. There are seven zones, each containing two acts and a boss battle, and there is a final zone at the end of the game that consists purely of boss fights. Obtaining all of the Chaos Emerald unlocks the Extra Zone. All characters can now perform various stunts when flying through the air and not curled in a ball (i.e. after being launched from a spring or similar).... full article at wikipedia