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Madeira's items:
Press Left, Y, Down, X, Up at the title screen.

Nova's items:
Press Left, Y, Down, Y, Right at the title screen.

Raine's items:
Press Left, X, Up, X, Up at the title screen.

Rico's items:
Press Left, X, Right, X, Right at the title screen.

Rumiko's items:
Press Left, Y, Left, Y, Up at the title screen.

Zari's items:
Press Left, Y, Left, Y, Right at the title screen.

Soundtrack songs:

Can You Feel The Sunshine ACID Mix: Accumulate over three hours of game play in Sonic R.
Living in the City LTN Mix: Start Sonic R ten times
Sonic 6290 Mix and Sonic Boom D'mb Mix: Start Sonic CD five times
Sonic After 6290 Mix: Start Sonic CD ten times

Museum pictures:

Sonic Adventure DX Artwork Set 1: Play Sonic Spinball five times
Sonic Adventure DX Artwork Set 2: Play Sonic Spinball ten times
Sonic Adventure DX Artwork Set 3: Accumulate over one hour of game play in Sonic Spinball
Sonic Adventure DX Artwork Set 4: Accumulate over two hours of game play in Sonic Spinball
Sonic CD Artwork Set 1: Play Sonic CD five times
Sonic CD Artwork Set 2: Play Sonic CD ten times
Sonic CD Artwork Set 3: Accumulate over one hour of game play in Sonic CD
Sonic CD Artwork Set 4: Accumulate over two hours of game play in Sonic CD
Sonic Championship logo: Complete Sonic: The Fighters
Sonic Heroes Movie Artwork Set 2: Play Tails Adventure ten times
Sonic Heroes Movie Artwork Set 3: Accumulate over one hour of game play in Tails Adventure
Sonic Heroes Movies Artwork Set 1: Play Tails Adventure five times
Sonic R Artwork Set 1: Play Sonic R five times
Sonic R Artwork Set 2: Play Sonic R ten Times
Sonic R Artwork Set 3: Accumulate over one hour of game play in Sonic R
Sonic R Artwork Set 4: Accumulate over two hours of game play in Sonic R
Sonic The Fighters Artwork Set 3: Accumulate over 1 hour of game play in Sonic: The Fighters
Sonic The Fighters Artwork Set 1: Play Sonic: The Fighters five times
Sonic The Fighters Artwork Set 2: Play Sonic: The Fighters ten Times
Sonic The Fighters Artwork Set 4: Accumulate over two hours of game play in Sonic: The Fighters
Sonic Vs. Metal Sonic Sonic Screensaver Artwork: Complete Sonic CD

Museum bonus pictures:
After unlocking these pictures, select them in the indicated order to unlock the corresponding bonus. A sound will confirm correct code entry.

160 (Chaotix logo from the top): 146, 145, 144, 142, 143
180 (Shape of a GEM): 162, 163, 164, 166, 170, 172, 174, 178
200 (Order pictures appear in the credits): 12, 23, 54, 10, 22, 25, 39, 56
218 to 219 (7 Metal Sonics): 10, 25, 39, 40, 56, 93, 160
220 (8 Sega logos): 18, 106, 118, 136, 137, 138, 139, 140
260 (Fighters CPU order): 5, 4, 9, 8, 3, 6, 7, 2, 10, 11
281 to 285 (6 Holiday): 110, 112, 122, 130, 132, 137

320: Complete all of the goals.
286 through 295: Watch the credits five times.
296 through 300: Watch the credits ten times.

Museum movies:

Sonic Adventure Intro Video: Accumulate over 24 hours of game play with over 70 overall games played.
Sonic Heroes Trailer: Accumulate over 24 hours of game play with over 30 overall games played.
Sonic's History Video: Accumulate over 24 hours of game play with over 50 overall games played.

Hints:
Allow a game to idle for over three hours to unlock the "Hints" option in the "Extra" menu.

Hint: Unlocking Museum bonuses:
To unlock most of the pictures in the Museum, just start each of the three main games five or ten times. Then, play each one for a few hours. Just leave the game idling. You do not have to be actually playing for that amount of time.

Hint: Museum slide show:
Press B on looking at a Museum picture to start a slide show featuring all unlocked pictures.

Unlocking Bare Knuckle 3:
Note: This game is only available in the Japanese version of Sonic Gems Collection. You must have already unlocked Vectorman and Vectorman 2, as well has have accumulated over a total of twelve hours of game time in Sonic Gems Collection. Then, play Bare Knuckle 2 at least one time, or play a combination of any other games over seventy times.

Fight as Ash:
Hold X immediately after giving the ending hit to Ash until the next part of the level starts. Then, intentionally lose all your lives. Choose to continue and Ash will be a selectable character.

Fight as Shiva:
Hold A immediately after giving the ending hit to Shiva until level 2 starts. Then, intentionally lose all your lives. Choose to continue and Shiva will be a selectable character.

Time Attack mode options:
Complete the game, then restart the game in "Time Attack" mode. The following options will be available if the "Time Attack" game can be completed within the corresponding time limit.

Music test
Complete "Time Attack" mode within 37:27:57. A "D.A. Garden" option will appear to the left of the "RAM Data" option on the main menu. The Planet of Mobius will be displayed.

Play bonus levels
Complete "Time Attack" mode within 30:21:05, then press Left at the "Time Attack" screen.

View video sequences
Complete "Time Attack" mode within 25:46:12. A "Visual Mode" option will appear to the left of "D.A. Garden" option on the main menu. Use this option to view the video sequences in the game.

Level select:
Press Up, Down(2), Left, Right, A at the Sonic CD title screen.

Programmer high scores:
Press Right(2), Up(2), Down, A at the Sonic CD title screen.

Sound test mode options:
Press Down(3), Left, Right, A at the Sonic CD title screen while "Press Start" is blinking to display the sound test menu. Set one of the following sound combinations and press Start to enable the corresponding cheat function.

Knockout Kings 2001 Cheat Codes

Radiant Emerald course:
Finish in first place on each normal course.

Play as Dr. Robotnik:
Finish in first place in the in the Radiant Emerald course. Alternately, successfully complete all levels.

Play as Puppet Tails:
Collect all five coins in Radical City and finish in first, second, or third place. Then, defeat Puppet Tails in a race.

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