Proto:Sonic Heroes/Mario Kart: Double Dash!! Bonus Disc

As a reward for preordering Mario Kart: Double Dash!!, customers received a bonus disc containing demos and videos of various upcoming games. One demo was Sonic Heroes, containing some differences from the final.

General Differences

 * There are only two teams and two levels playable: Team Sonic (Seaside Hill) and Team Dark (Bullet Station).
 * Some sounds are different, and Omega's voice is not filtered.
 * Some level objects have been rearranged.