From coremagazine.com…
Sega is gearing up for the release of the latest chapter in their Sonic series on the Game Boy Advance. Scheduled for release on December 20th in Japan, Sonic Advance will feature four playable characters; Sonic, Tails, Knuckles, and Amy. At first glance the game appears reminiscent of its 16-bit predecessors, however, Sega has a few added goodies planned for Sonic Advance. Specifically, new gameplay elements including rail sliding and several linkup mini-games are expected in the finished version.
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Source – www.coremagazine.com