Bonus challenge:
Highlight "Sonic World" at the main menu and hold Start + A. A new challenge will begin that requires all 100 rings to be collected within one minute.

Level select:
Select the original Sonic game. Quickly press Up, Down, Left, Right during the opening sequence. A sound will confirm correct code entry. The, hold A and press Start.

For Sonic 2, enter the options screen, and play sounds 19, 65, 09 and 17.

For Sonic 3, play the previously described sounds, then hold A and press and release Reset. Select Sonic 3 when the game restarts, then release A and press Up at the title screen. A sound test option will appear. Use this option to enable level selection.

Play Sonic 3 plus Sonic and Knuckles or Sonic 3 alone. Play as any character and go to "Angel Island". Go to where the swinging vines are and grab one. Then, press Left(3), Right(3), Up(3). A sound will confirm correct code entry. Press Start + Select to restart the game. Choose the "Sound test" option at the title screen to select all of the Sonic 3 levels and all the Sonic and Knuckles levels.

All Chaos Emeralds in Sonic 2:
Play sounds 04, 01, 02, and 06.

Change Tails to Miles (Sonic 2):
Press Up, Down(3), Up at the title screen. A sound will confirm correct code entry.

View movie sequences in order:
Highlight the first movie in the theater, then hold X and press A.

Looping movie:
Hold Z when selecting a movie in the theater. Release the button after the movie starts.

Remove paused game text:
Press X + Y + Z when game play is paused.

Bonus codes:
Locate the 3D versions of the classic Sonic power-up boxes in the Sonic World level. Approach the boxes and press A, B, or C to view codes from other games in the Sonic series.

Hidden files:
Insert the game disc into a PC compatible CD-ROM drive to access the following directories and files:

The root directory contains AVI animation files.
The "extras" directory contains screen shots from the game in .BMP format.
The "man_eng1" and "man_jpn4" contains images of the in-game manual in .TIF format.
The "sonic12" directory contains sound files in .AIF format.