The world can be a confusing and dangerous place, especially when there are two of you! Sonic must face the new, villainous Shadow but you choose how the story unfolds - you can be a hero, or make friends with the dark-side! In the most thrilling Sonic Adventure ever created there are 6 playable characters, new moves to master, over 30 challenging stages and 3 different 2 player games - will you save the world or conquer it?