Level Select / Sound Test - Go to options, then in sound test press 19, 65, 09, 17. With the C key, (or the assigned C button for emulators)

Debug - In the Sound Test (in level select menu) press 01, 09, 09, 02, 01, 01, 02, 04. With the C key.

Super Sonic (All Chaos Emeralds) - In the sound test (in level select menu) press 04, 01, 02, 06. WITH THE C key

*Change name from Tails -> Miles - U, U, U, D, D, D, U. At title screen.

Silence - Play 7E in Sound Test (Normal Options).

Music only plays Oil Ocean Theme (It loops) - 01, 09, 09, 02, 01, 01, 02, 04 in Sound Test (Normal Options)

*U = Up

*D = Down

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Sonic The Hedgehog 1 

Config Mode (Debug Mode) - Up, C, Down, C, Left, C, Right, C. Before game demo starts. Then hold A and press start.

Level Select - Hold A and press Up, Down, Left, Right. Then hold A and press start.

Secret Game Message - Before game demo starts press C, C, C, C, C, C, Up, Down, Left, Right. When game demo starts hold A +B+C and press start.


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Sonic 3D Blast

*Level Select - B, A, R, A, C, U, D, A. At menu (REALLY FAST!)
R = Right
U = Up
D = Down

A & B are the actual buttons.


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Shinobi III

Infinite Shruikens - Got to options, change number of shruikens to 0, then hover over it for a few seconds. I will turn into a "∞"!


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Sonic 2 & Knuckles

Level Select - U, U, U, D, D, D,L, R, L, R

Debug Mode - AT SOUND TEST -- 1, 9, 9, 4, 1, 0, 8

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MS-DOS GAMES

Doom

No Clip - IDSPISPOPD

God Mode - IDDQD

All Weapons, Keys, and Ammo - IDKFA

Area Map - IDBEHOLD-A

Night Vision Goggles - IDBEHOLD-L

Berserk Mode (One Hit Punches) - IDBEHOLD-S

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Wolfenstein 3D

Debug Mode (MUST DO THIS FOR OTHER CODES TO WORK A.K.A. The Master Code)  - Start Game by typing "wolf3d-goobers" without quotes.

To Enable Debug Mode In Game - Press L-Alt + L-Shift + Backspace (In-Game)

Change The Border Color - TAB + B

Warp To The End of The Current Level - TAB + E

Displays Your Coordinates - TAB + F

God Mode - TAB + G

Removes Health - TAB + H

Boost Your Weapons, Health and Ammo - TAB + I

Activates Slow-Motion Mode - TAB + S

Warp To Any Level - TAB + W

Gives You "Extra Stuff" (?) - TAB + X

100% Life, 99 Ammo, Both Keys, and All of The Guns - I + L + M