Sonic Mega Collection - Sonic 1 Cheats Walkthrough - Guide for Sonic Mega Collection

Play as Tails
You can use controller two to control Tails after he has been obtained in Story mode.
Sonic Adventure DX Cheats. Platform: GameCube. Type: Cheat Codes / Hints / Tips. Cheat ID: 47097. Sonic Adventure DX Cheats added on Jun 26, 2003.

Sonic 2 - level select
At the Sonic The Hedgehog 2 main menu, Tails will blink his eyes (first once, then two times quickly). While holding Down/Left + A + B, tap Start just when his eye shuts on the second blink of the double-blink.
Sonic Adventure DX Cheats. Platform: GameCube. Type: Cheat Codes / Hints / Tips. Cheat ID: 47235. Sonic Adventure DX Cheats added on Jul 27, 2003.

Sonic Chaos: Unlock levels
Go to the Sonic Chaos menu screen and when it says to press start, hit up, up, up, up, right, left, right, left, start.
Sonic Adventure DX Cheats. Platform: GameCube. Type: Cheat Codes / Hints / Tips. Cheat ID: 47098. Sonic Adventure DX Cheats added on Jun 26, 2003.

Sonic Labyrinth: Unlock levels
When it says to press start at the Labyrinth title screen, hit up(2 times), right(3 times), down(6 times), left(9 times).
Sonic Adventure DX Cheats. Platform: GameCube. Type: Cheat Codes / Hints / Tips. Cheat ID: 47100. Sonic Adventure DX Cheats added on Jun 26, 2003.

Sonic Spinball - disable gravity
Enter the Sound Test option for Sonic Spinball. Now play the following songs in order: 0, 9, 0, 1, 6, 8. 
Sonic Adventure DX Cheats. Platform: GameCube. Type: Cheat Codes / Hints / Tips. Cheat ID: 47233. Sonic Adventure DX Cheats added on Jul 27, 2003.

Sonic Spinball - fast background music
Go to the Sound Test option for Sonic Spinball. Now play the following songs in this order: 0, 4, 2, 5, 5, 7. 
Sonic Adventure DX Cheats. Platform: GameCube. Type: Cheat Codes / Hints / Tips. Cheat ID: 47237. Sonic Adventure DX Cheats added on Jul 27, 2003.

Sonic Spinball - level select
Enter the Sound Test option for Sonic Spinball. Then, play the following songs in this order: 0, 2, 1, 5, 6, 6. 
Sonic Adventure DX Cheats. Platform: GameCube. Type: Cheat Codes / Hints / Tips. Cheat ID: 47236. Sonic Adventure DX Cheats added on Jul 27, 2003.

Sonic Spinball - zoomed view
Go to the Sound Test for Sonic Spinball. Now play the following songs in this order: 0, 2, 1, 1, 6, 6.
Sonic Adventure DX Cheats. Platform: GameCube. Type: Cheat Codes / Hints / Tips. Cheat ID: 47234. Sonic Adventure DX Cheats added on Jul 27, 2003.

Toggle Game Gear screen
To view Game Gear games in a smaller, non-pixelated view, hit L + R. Hit L + R again to go back to normal view.
Sonic Adventure DX Cheats. Platform: GameCube. Type: Cheat Codes / Hints / Tips. Cheat ID: 47095. Sonic Adventure DX Cheats added on Jun 26, 2003.

Two player Game Gear mode
Hit start on the second controller to show a second Game Gear screen. If the game supports multiplayer linking it will switch to multiplayer mode.
Sonic Adventure DX Cheats. Platform: GameCube. Type: Cheat Codes / Hints / Tips. Cheat ID: 47093. Sonic Adventure DX Cheats added on Jun 26, 2003.

Unlock GameGear Games
Get a Sonic emblem or finish ten missions. The 'minigame' option will be added to the main menu.
Sonic Adventure DX Cheats. Platform: GameCube. Type: Cheat Codes / Hints / Tips. Cheat ID: 47038. Sonic Adventure DX Cheats added on Jun 19, 2003.

Unlock Metal Sonic
Collect all 130 Emblems. Metal Sonic will become available in trail mode.