Mez's Codes...

[Mezmorize]

Rhino Rumble (UE) (GBC)

7 More Extra Lives
At the Title Screen, press Up, Down, Left, Right, Down, Up, Right, Left, B. The screen will flash confirming proper entry. When you start the game you’ll have 10 extra lives instead of 3.

Game Genie code:
Infinite Lives
009-42B-91E

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Ready 2 Rumble Boxing (U) (GBC)

View Developer Credits
At the Title Screen, and while Press Start is flashing, press Left, Left, Up, Down, Right, Right, Select.

There is another cheat which should likely be entered in at the same screen and after the above cheat has been entered, but I can’t tell if there is any effect. Here’s the unknown code:
Up, Up, Right, Left, Down, Down, Select.

[Mezmorize]

R-Type DX (UE) (GBC)

De Souza Mode Accessible
051-3CB-F7A
Note: Press Left on the Game Selection screen to have access to De Souza level creation mode.

[Mezmorize]

Passwords - San Francisco Rush 2049 (U) (GBC)

Cheat Passwords:
NOCTOC - Unknown
SPEEDY - Increased Traveling Speed
MOREGAS - Faster Starting Speed
GETGRIP - Increased Handling
BLASTED - More Turbo Pickups
OIL - More Oil Slicks
GRIP - More Handling Pickups

[Mezmorize]

Debug Menu - Scrabble (E) (GBC)

Debug Menu - Scrabble (E) (GBC)

Debug Menu Unlocked
06F-13B-F7E (Debug Menu Showing In Help Section)
05F-2EB-F7A (Press Up While Highlighting General Help To Access The Debug Menu)
05F-65B-E6E (Press Down While Highlighting Conundrum Controls To Access The Debug Menu)

[Mezmorize]

The Simpsons: Night of the Living Treehouse of Horror [Sound Test]

The Simpsons: Night of the Living Treehouse of Horror (UE) (GBC)



FX Test And Music Test Accessible
052-4DA-E66
Note: Press Down while highlighting Difficulty to show the two new options.

I believe this was disabled, I was not able to get it to function.
Although it could be unlocked from a password, this text is in the ROM:
"Well Done.......You have earned a secret password...Guard it carefully"

Was only able to get 3 of the 17 tracks to play:
Music Playing In Options Modifier
??2-41A-E62
??=00-04

[Mezmorize]

Stage Skip - The Smurfs Nightmare (U) (GBC)

Stage Skip - The Smurfs Nightmare (U) (GBC)

At the Title Screen press Left, Up, Down, Down, Right, Up, Left. Press Select during game play to skip to the next stage.

This same cheat works for the original Game Boy version of the game "The Smurfs 3".

Stage Skip Enabled
3E5-D4F-7F1
Note: Code must be turned on before leaving the Main Menu.

Passwords:
01, 03, 04 - The Rabbit Race (Easy)
04, 01, 03 - The Rabbit Race (Hard)
02, 04, 01 - The Mysterious Planet 1 (Easy)
04, 00, 02 - The Mysterious Planet 1 (Hard)
04, 00, 03 - The Workbench Gone Mad 1 (Easy)
01, 04, 04 - The Workbench Gone Mad 1 (Hard)

The numbers correspond with how many times you press Down while highlighting the character's image.
00=Smurf with chef hat
01=Smurf with glasses
02=Smurf with circle around him
03=Smurf with headband
04=Smurf with mouth open

[Mezmorize]

Passwords - Snoopy Tennis (U) (GBC)

Only one of the four posted passwords on GameFaqs works for this game, and it's not really the correct description. Here's the full list of passwords:

Passwords - Snoopy Tennis (U) (GBC)

Easy Difficulty:
QWRT - Championship Stage 2 as Snoopy
NHVR - Championship Stage 6 as Snoopy & Woodstock Unlocked
ZVXK - Championship Stage 2 as Charlie Brown
GKXD - Championship Stage 6 as Charlie Brown & Woodstock Unlocked
FNDZ - Championship Stage 2 as Lucy
WVNT - Championship Stage 6 as Lucy & Woodstock Unlocked
HWDB - Championship Stage 2 as Linus
TGKX - Championship Stage 6 as Linus & Woodstock Unlocked
XDSW - Championship Stage 2 as Franklin
WQWH - Championship Stage 6 as Franklin & Woodstock Unlocked
BGLV - Championship Stage 2 as Sally
GXVZ - Championship Stage 6 as Sally & Woodstock Unlocked
VBMX - Chapmionship Stage 2 as Peppermint Patty
FVMQ - Championshop Stage 6 as Peppermint Patty & Woodstock Unlocked
SNVH - Chapmionship Stage 2 as Schroeder
SWTH - Championship Stage 6 as Schroeder & Woodstock Unlocked
LRQT - Championship Stage 2 as Pig Pen & Pig Pen Unlocked
GHJZ - Championship Stage 6 as Pig Pen & Pig Pen Unlocked
LNHJ - Championship Stage 2 as Marcie & Marcie Unlocked
XRNV - Championship Stage 6 as Marcie & Marcie Unlocked
GFBX - Championship Stage 2 as Rerun & Rerun Unlocked
TDPC - Championship Stage 6 as Rerun & Rerun Unlocked
WHGX - Championship Stage 2 as Woodstock & Woodstock Unlocked
NSSB - Championship Stage 6 as Woodstock & Woodstock Unlocked

Medium Difficulty:
PRMW - Championship Stage 2 as Snoopy
BWTH - Championship Stage 6 as Snoopy & Woodstock Unlocked
GQMN - Championship Stage 2 as Charlie Brown
RRLD - Championship Stage 6 as Charlie Brown & Woodstock Unlocked
WGSL - Championship Stage 2 as Lucy
CTJJ - Championship Stage 6 as Lucy & Woodstock Unlocked
HQDH - Championship Stage 2 as Linus
MBQF - Championship Stage 6 as Linus & Woodstock Unlocked
ZZFT - Championship Stage 2 as Franklin
MMRT - Championship Stage 6 as Franklin & Woodstock Unlocked
TPCC - Championship Stage 2 as Sally
VPBD - Championship Stage 6 as Sally & Woodstock Unlocked
MPQL - Chapmionship Stage 2 as Peppermint Patty
LQQK - Championshop Stage 6 as Peppermint Patty & Woodstock Unlocked
BSHH - Chapmionship Stage 2 as Schroeder
BLDD - Championship Stage 6 as Schroeder & Woodstock Unlocked
CBZZ - Championship Stage 2 as Pig Pen & Pig Pen Unlocked
TXTM - Championship Stage 6 as Pig Pen & Pig Pen Unlocked
VQFF - Championship Stage 2 as Marcie & Marcie Unlocked
RTCB - Championship Stage 6 as Marcie & Marcie Unlocked
VHLG - Championship Stage 2 as Rerun & Rerun Unlocked
XCHH - Championship Stage 6 as Rerun & Rerun Unlocked
MPKF - Championship Stage 2 as Woodstock & Woodstock Unlocked
WCPT - Championship Stage 6 as Woodstock & Woodstock Unlocked

Hard Difficulty:
XZNZ - Championship Stage 2 as Snoopy
DPTF - Championship Stage 6 as Snoopy & Woodstock Unlocked
FWJB - Championship Stage 2 as Charlie Brown
CBJS - Championship Stage 6 as Charlie Brown & Woodstock Unlocked
JFKH - Championship Stage 2 as Lucy
RSWL - Championship Stage 6 as Lucy & Woodstock Unlocked
WJXC - Championship Stage 2 as Linus
MJQS - Championship Stage 6 as Linus & Woodstock Unlocked
KWSJ - Championship Stage 2 as Franklin
WDVD - Championship Stage 6 as Franklin & Woodstock Unlocked
ZDHV - Championship Stage 2 as Sally
QNVG - Championship Stage 6 as Sally & Woodstock Unlocked
PSHX - Chapmionship Stage 2 as Peppermint Patty
SSXN - Championshop Stage 6 as Peppermint Patty & Woodstock Unlocked
XXTP - Chapmionship Stage 2 as Schroeder
LCSP - Championship Stage 6 as Schroeder & Woodstock Unlocked
WVDR - Championship Stage 2 as Pig Pen & Pig Pen Unlocked
CCWV - Championship Stage 6 as Pig Pen & Pig Pen Unlocked
SHNR - Championship Stage 2 as Marcie & Marcie Unlocked
WJDP - Championship Stage 6 as Marcie & Marcie Unlocked
VWZR - Championship Stage 2 as Rerun & Rerun Unlocked
ZWDX - Championship Stage 6 as Rerun & Rerun Unlocked
XLXF - Championship Stage 2 as Woodstock & Woodstock Unlocked
PNJW - Championship Stage 6 as Woodstock & Woodstock Unlocked

Not Used (?):
WXRS
FGPS

[Mezmorize]

Cheat Mode - Space Invaders (U) (GBC)

Cheat Mode - Space Invaders (U) (GBC)

Cheat Mode
At the Main Menu and while highlighting Play, press Left, Left, Right, Right, Left, Right, Left, Right, Left, Left, Right, Right. A new menu named Test will appear with a Stage Select, as well as an Invulnerability option.





Edit:
Test Menu Unlocked
001-C7B-E62
Note: The code must be enabled before reaching the Main Menu.

[Mezmorize]

Passwords - Space Marauder (U) (GBC)

Passwords - Space Marauder (U) (GBC)

Stage Passwords:
BBBB - Stage 1 (Easy)
BRFG - Stage 2 (Easy)
KTDC - Stage 3 (Easy)
DRMF - Stage 4 (Easy)
SRSD - Stage 5 (Easy)

CCCC - Stage 1 (Medium)
NKMR - Stage 2 (Medium)
TCKP - Stage 3 (Medium)
NQTK - Stage 4 (Medium)
MQFH - Stage 5 (Medium)

DDDD - Stage 1 (Hard)
KDMT - Stage 2 (Hard)
SNNS - Stage 3 (Hard)
KMGT - Stage 4 (Hard)
MSKD - Stage 5 (Hard)

MLTM - Stage 1 (Extra)
TNTM - Stage 2 (Extra)
TTKM - Stage 3 (Extra)
QGRR - Stage 4 (Extra)
TMSH - Stage 5 (Extra)

Cheat Passwords:
QJQK - 99 Lives
CMMD - Unknown

--

Game Genie codes:
Start With 99 Lives
99E-C2F-E62

Infinite Lives
007-BEE-E6E

[Mezmorize]

SpongeBob SquarePants: Legend of the Lost Spatula (UE) (GBC)

Level Select Enabled (Pause Menu)
181-9CA-6EA

[Mezmorize]

Delete Save - Super Chinese Fighter EX (J) (GBC)

Delete Save - Super Chinese Fighter EX (J) (GBC)

Highlight Hidden Delete Save Option
0104EEDC
Note: Enable in the Options Menu to highlight it, then disable the code before pressing a button.





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Super Mario Bros. Deluxe (UE) (Rev B)

You VS Boo & For Super Players Mode Accessible
18E-A1B-6EA
C9E-2FB-E69
Note: You VS Boo is the invisible selection on the right side, and For Super Players is on the left.

The GameShark code is better since it will show the icons also without having extra lines of codes, but it was already in the database come to find out:

Unlock You VS Boo and SMB Lost Levels
010392C1

[Mezmorize]

Passwords - Tabaluga (Germany) (GBC)

H0RZSHM0RZ Infinite Lives
0NDS1KW0NZ View Credits
--UNUSED--
--UNUSED--
M00NW0LK0R Walk Backwards
1CHFL11G00 Flying Ability
000H01SS00 Flame Ability
H0LB1SH0RZ Half Damage

Game Genie codes:
Have Superherz Item (Infinite Lives)
20B-04A-4CA

Have Flying Ability
20B-0DA-4CA

Have Flame Ability
20B-16A-4CA

Half Damage
20B-1FA-4CA

[Mezmorize]

Turns out that all the cheats I had found for the original Game Boy also work on the Game Boy Color re-release (including Game Genie).

Title Screen Cheats - Tom & Jerry (UE) (GBC)

Infinite Lives
A, Down, Up, Right, Up, A, Start.

Infinite Time
Left, Left, B, Left, Right, A, Start.

Stage Select (Password Menu)
Right, B, Up, Up, Left, A, Start.

Infinite Health
B, A, Up, Left, Right, Down, Start.

Sound Test
Left, Left, Right, Right.

View The Ending
Up, Down, Left, A, A, B, Start.

Infinite Projectiles
B, Left, A, A, Up, Left, Start.

--

Game Genie codes:
Sound Test Enabled
C98-74B-E69

Infinite Time
C9C-1EE-E69

Infinite Lives
188-50D-6EA

Stage Select Enabled (Password Menu)
3CD-0DB-3B4

Infinite Health
C9D-34D-E69

Infinite Projectiles
186-7CB-6EA

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Tiny Toon Adventures: Dizzy's Candy Quest (E) (GBC)

Jukebox Accessible
02E-A4B-E6A
Note: Press A right after entering the Options Menu to open Jukebox.

[Mezmorize]

Tom and Jerry in Mouse Attacks! (U) (GBC)

Minigames Menu Unlocked (Main Menu)
3C1-0AB-7F4

All Minigames Unlocked
033-CFB-E6E
Note: Block Game and Pie Panic unlocked by default, Live Bait and Water Skiing accessible.

[Mezmorize]

Passwords - Top Gear Pocket (U) (GBC)

All Cars Unlocked, All Tracks & All Gold Trophies
V-WRKS

Clear Trophies (Same password but backwards)
SKRW-V

Game Genie codes:
All Cars Unlocked
0F1-D5F-E62

All Tracks Unlocked
081-DAF-E66