3 Choume no Tama: Tama and Friends - 3 Choume Obake Panic!!

3 Choume no Tama: Tama and Friends - 3 Choume Obake Panic
Developer: Tom Create Publisher: B-AI Platform: Game Boy Released in JP: August 5, 1994 This game has a hidden sound test.

Sound Test

On bootup, before the initial copyright screen appears, hold Up + Start to access a sound test. B cycles through sound effects, while A does the same for music. Additionally, Left and Right slow down and speed up the sound, respectively.