Sonic Boom

Sonic Boom is a total modification of Sonic 2, created by snkenjoi and iojnekns, along with a wide array of talented contributors. As of the Seventh Annual Hacking Contest, this collective is referred to as SÆGA.

Moves
In the air and in a ball

Flying Kick A (costs 5 rings)
Double Jump B
Diagonal Dash C (costs 2 rings)
Downward Dive Down (costs 1 ring)
In the air and not in a ball

Air Roll (Go into a ball) Down
On the ground and running/standing

Walk/Limit Speed Hold A
On the ground and rolling

Stand up Up