Successfully complete the game in adventure mode with
all characters to unlock the "Mission Mode" option at
the main menu.
Cheats: Chaos
Cheats: Battles
Cheats: Locations
Cheats: Characters
Cheats: Items
Cheats: Dr. Robotnik's Mean Bean Machine
Cheats: Sonic The Hedgehog
Cheats: Sonic The Hedgehog 2
Cheats: Sonic Blast
Cheats: Sonic Chaos
Cheats: Sonic Drift
Cheats: Sonic Drift 2
Cheats: Sonic Labyrinth
Cheats: Sonic Spinball
Cheats: Sonic Triple Trouble
Cheats: Tails Adventure
Cheats: Tails Skypatrol
Strategy: Mission descriptions: by Rahaining