Atomic Punk (Game Boy)

Atomic Punk
Also known as: Bomber Boy (JP), Dynablaster (EU) Developer: Hudson Soft Publisher: Hudson Soft Platform: Game Boy Released in JP: August 31, 1990 Released in US: October 1991 Released in EU: 1991 This game has a hidden sound test. This game has regional differences.

This is indeed a Bomberman game, just with a different title. It even has a special mode based on the NES game! It's also the first Bomberman game to have a battle mode (called "VS.MODE")!

Sound Test

In the normal game mode (GAME A or BOMBER BOY), at the STAGE SELECT screen, enter the MY TOWN location with Right + Select + B + A held. Note, that when you press Right a map selection is changing, so you need either to put it to the left of the MY TOWN before holding all the buttons, or press Right until you stand on the right one position and hold it there, and then hold the rest of the buttons.

Regional Differences

In the Japanese version, the mode based on the NES game appropriately changes the title screen to Bomberman.