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Lil' Monster

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Title Screen

Lil' Monster

Also known as: Gem Gem Monster (JP)
Developer: KID
Publishers: KID (JP), Agetec (US)
Platforms: Game Boy, Super Game Boy, Game Boy Color
Released in JP: July 30, 1999
Released in US: August 2000

GraphicsIcon.png This game has unused graphics.
TextIcon.png This game has unused text.
DebugIcon.png This game has debugging material.
LevelSelectIcon.png This game has a hidden level select.

NotesIcon.png This game has a notes page

Lil' Monsters flinging poo. *Use Xlas* over-the-counter attack!


Miscellaneous tidbits that are interesting enough to point out here.

Debug Menu

Lil Monster U GB Debug Screen.PNG Lil Monster U GBC Debug Screen.PNG Lil Monster SGB Debug Screen.PNG

Game Genie code 001-E6F-F76 will start the game in a debug menu listing the version number of the game as well as the console the game is being played on.

OBJ Mode

Lil Monster GBC OBJ Mode.PNG

Displays characters in-game.

Message :Trs

Lil Monster GBC Message 1.PNG

Displays all basic messages in the game. There are development and test messages.

Message :Trs2

Lil Monster GBC Message 2.PNG

Displays all dialogue messages in the game.

Message :TCom

Lil Monster GBC Message 3.PNG

Displays all item messages in the game.

Event Mode

Lil Monster GBC Enent Mode.PNG

Tests all game events. Most are broken and some will glitch out the menu or even crash the game.

OBJ Mode 2

To do:
Some sprites are clearly unused, may be left overs from its JP only predecessor.

Lil Monster GBC OBJ Mode 2.PNG

Displays all sprites in-game.

Unused Sprites

To do:
The large monster sprites are JP only unlockables, and are used. Get JP only screenshots for regional differences


These frames are loaded into VRAM next to the teacher's standing frame, but are never triggered in the two scenes he is present.


Large monster sprites located at 0x0f0000. They don't seem to correspond to any in-game designs.

Unused Song Titles

To do:
Unused jingles are accessible via hacking, should extract them.
  Lil' Monster 
  PoP Forest   
   Tan Field   
 Little battle 
   Aloe Lake   
  Wave battle  
  Pin Desert   
Burning battle 
   Mt. Coral   
  Moon battle  
  Next world   
  Gene battle  
  Cool battle  
  Battle Kids  
   Olive town  
  Mini Car GP  
   Dream hour  
You got monster
  Good ending  

Stored next to the song titles at ROM address 0x45C1A in the Sound Test includes two strings that are inaccessible via selection, neither of which are relevant as the proper credits song is listed as "You got monster". Activating the Game Genie code 1AA-BA9-80A in the sound test will allow them to be selected, but don't seem to play correctly.

Test Messages

All of these test and development-related messages are found within the first test message menu.

(Source: nensondubois)