Based on Sonic Advance 2 and featuring four playable characters.
Ultimate Flash Sonic Game Information
Objective Speed your way through seven zones, each containing two acts and a boss fight. Collect special rings along the way to access special stages for a chance to win a Chaos Emerald; obtain them all to unlock the extra zone.
Controls Arrow keys : Move character Space bar : Jump Enter : Pause game Down + space > release down : Spindash