Enter the following codes to unlock the corresponding effect.

Sonic Spinball - Unlock Level Select:
At the Sound Test option play the song in the following order - 0, 2, 1, 5, 6, 6

Sonic Spinball - Unlock Fast Background Music:
At the Sound Test option play the song in the following order - 0, 4, 2, 5, 5, 7

Sonic Spinball - Unlock Zoomed View:
At the Sound Test option play the song in the following order - 0, 2, 1, 1, 6, 6

Sonic Spinball - Unlock No Gravity:
At the Sound Test option play the song in the following order - 0, 9, 0, 1, 6, 8

Sonic Chaos - Unlock Instant Chaos Emeralds:
At the Character Select screen press Up, Down, Up, Down, B, A, B, A, B, A

Sonic Chaos - Unlock Level Select:
At the Title screen press Up, Up, Up, Up, Right, Left, Right, Left, Start

Sonic Labyrinth - Unlock Level Select:
At the Title screen press Up, Up, Right, Right, Right, Down, Down, Down, Down, Down, Down, Left, Left, Left, Left, Left, Left

Sonic Chaos - Unlock Sound Test:
At the Title screen press Down, Down, Up, Up, Left, Right, Left, Right, B, A

Sonic Triple Trouble - Unlock Sound Test or Time attack:
At the Title screen press Up or Down.

Sonic the Hedgehog 2 - Unlock Level Select:
At the Title screen hold Down Left + A + B and when Tails blinks the 2nd time press Start.

Unlock Level Select in Sonic Triple Trouble:
At the SEGA logo screen wait for when Knuckles touches the red Emerald then press Start.


Unlockable Characters, Mini Games and Mission Mode

Unlock Sonic Labyrinth:
Complete 20 Missions

Unlock Sonic the Hedgehog 1:
Collect 20 Emblems

Unlock Sonic Drift:
Collect 40 Emblems

Unlock Sonic Spinball:
Complete 40 Missions

Unlock Sonic Chaos:
Collect 60 Emblems

Unlock Sonic the Hedgehog 2:
Collect 80 Emblems

Unlock Dr. Robotnik's Mean Bean Machine:
Collect 100 Emblems

Unlock Sonic Drift 2:
Collect 110 Emblems

Unlock Sonic Triple Trouble:
Collect 130 Emblems

Unlock Tails Skypatrol:
Collect 120 Emblems and complete 40 missions

Unlock Amy:
Beat Windy Valley with Sonic

Unlock Big:
Talk to Big in Station Square

Unlock E102 Gamma:
Beat E102 Gamma with Sonic or Tails

Unlock Tails:
Beat Emerald Coast with Sonic

Unlock Knuckles:
Beat Knuckles with Sonic or Tails in Story mode

Unlock Sonic Blast and Tails Adventure:
Get ALL 130 Emblems and complete ALL 60 Missions

Unlock Super Sonic:
Beat Sonic's Tails' Knuckles' Amy's E102 Gamma's and Big's stories

Unlock Metal Sonic:
Collect ALL 130 Emblems and Beat a charcter's story (except Super Sonic and Metal Sonic's)

Sonic Chaos Mini-Game
On the Sonic Chaos title screen press the following combination:
Up, Up, Up, Up, Right, Left, Right, Left, Start.

Sonic Labyrinth Mini-Game
On the Sonic Labyrinth title screen press the following combination:
Up(2), Right(3), Down(6), Left(9).

Sonic Spinball Mini-Game
In the Sound test for Sonic Spinball play music 0, 2, 1, 5, 6, 6.