SD Command Gundam: G-Arms

SD Command Gundam: G-Arms
Developer: Mic Publisher: Bandai Platform: Game Boy Released in JP: May 18, 1991 This game has hidden developer credits. This game has hidden development-related text. This game has a hidden sound test. This game has a hidden level select.

Sound Test

At the title screen, choose SDダイズガン, then G・アームズクン, then コマンドガンダム. Wait for the screen that loads to fully appear, then press Left. The sound test also contains a credit for Kenichi Kamio, the game's composer.

Level Select

At the title screen, choose SDダイズガン, then G・アームズクン, then コマンドガンダム. Wait for the screen that loads to fully appear, then press Down.

(Source: Game tricks Encyclopedia Wiki)

Hidden Programmer Credit

Inside the ROM at 0x160 is this little credit and build date.

****************
*COMMAND GUNDAM*
*    G-ARMS    *
*  1991/02/13  *
****************
                
   Written by   
Yoshitaka Ohsawa