Sonic Mega Collection Cheat Codes (GameCube)

Sonic Mega Collection is a collection of Mega Drive/Genesis games in the Sonic the Hedgehog series that recompiles some older titles for Nintendo GameCube, similar to Sonic Jam. In addition, extra content that provides Sonic history and extra bonus games have been included all in one disc. This was the first Sega game to reunite the classic "SE-GA" chant since the early-late '90s (Sonic 3D Blast has the "SEGA!!" scream), likely included due to the retro nature of the compilation.

Codes

Comix Zone Cheats (Japanese version only)
For cheats in Comix Zone, go to the jukebox and play these numbers. Use the X button to play the music tracks.

Level Select - play 14-15-18-5-13-1-3-18-15-6, then highlight 1-6 and press X to select your stage.

Invincibility - play 3-12-17-2-2-10-2-7-7-11

Finish Game (Sonic 3D)
If you use the level select cheat (At Press Start bit press A B Right B X Up Down B then press start on start game) then start the final fight and then press start and then B and the game will do its ending sequence

At Press Start bit press A B Right B X Up Down B then press start on start game - Level Select

In Final Fight START then B - Finish game

Flicky Level Select
This can be activated when you start a game.

Start a game and hold Up, A, X, and Start. When Round 1 appears release the buttons - Level Select

Knuckles in Sonic 2 Debug Code
The debug code for Sonic 2 and Knuckles is different to normal Sonic 2. When in the level select screen, which is accessed by pressing Up (x3), Down (x3), Left, Right, Left, Right, then holding the button which is the equivalent of the Mega drive A Button and pressing start, go to the sound test section and play the following sounds, using the Mega Drive B button:

1, 9, 9, 4, 1, 0, 1, 8

Then select the level you wish to debug and hold the mega drive A button, then press start. The Debug controls are:

Mega Drive A: Cycle sprites

Mega Drive B: Toggle between knuckles and sprite

Mega Drive C: Place sprite in level

Level Select Codes
Enter the codes below to select the level in various Sonic games:

While on options screen enter: B, Down, A, Down, X, Down, B, A, Up, B, X, Up, A, X, Up - New Level Select for Sonic Spinball

On the ''Press Start'' screen, press A, B, Right, B, X, Up, Down, B, Start - Sonic 3D Blast Level Select.

At the title screen hit: Up, Down, Left, Right. Then hold B and press Start to access the level select list - Sonic the Hedgehog Level Select

Sonic 2 codes
Go to the sound test options, and play 01, 01, 02 and 04. Then press start - 14 continues

At the title screen, press Up, Up, Up, Down, Down, Down, Up and a sound will be heard - Change Tails' name to Miles (vice versa on Japanese version)

Sonic The Hedgehog- Debug Mode
After performing the Level Select code (up, down, left, right, B+Start), go back to the game title with Z. During the title screen, push up, X, down, X, left, X, right, X, then B+Start. Pick a level and push B+Start to begin. The debug mode should be active. Push A to enter/exit the mode, B to swap items, and X to place them.

Stage select
On Sonic The Hedgehog 2 sound test screen, play sounds in the following order: 19, 65, 9, 17 then keep pressing a+start simultaneously. You may be taken into the first level but keep on doing it, you will be taken to a stage select screen.

Included in the game pack there's a history of the Sonic games that were released till now. Here's a video of it: