Ghostbusters II (Game Boy)

Ghostbusters II
Developer: HAL Laboratory Publishers: Activision (EU/US), HAL Laboratory (JP) Platform: Game Boy Released in JP: October 16, 1990 Released in US: December 1990 Released in EU: 1990 This game has a hidden sound test. This game has regional differences.

Ghostbusters II is the Game Boy version of New Ghostbusters II and was even released first. It features slower paced gameplay more fit for the handheld's small screen. America actually got it this time, too!

Sound Test

The Japanese version of the game has a hidden sound test (with a visualization of the sound channels and tones being played) which was removed from the US / European release. To access it, lose the game. On the Continue screen, highlight "End" with the cursor, press and hold Select, then press B. Press Up or Down to change the selected sound, and press A to play it.

(Source: http://urawaza.in/gb/gostb2.htm)

Ending Test

You can also see the game ending in the Japanese version by losing a game, selecting "End" with the cursor, holding Select, and pressing A. The game will freeze after the ending finishes.

(Source: http://urawaza.in/gb/gostb2.htm)