Fish Dude

Fish Dude
Also known as: Uoozu (JP) Developer: Towa Chiki Publishers: Towa Chiki (JP), SOFEL (US) Platform: Game Boy Released in JP: October 5, 1990 Released in US: April 1991 This game has hidden developer credits. This game has a hidden sound test. This game has a hidden level select.

Dude. It's a fish. Who is also a dude.

Hidden Text

This string is found at the beginning of the ROM at 0x70:

                
            1990
  SALIO & ANex  
                

Passwords

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The Japanese version of the game includes 6 hardcoded passwords. To activate them, hold Down and press Start on the password screen after entering them.

• STAF — Opens a staff roll.
• MSIC — Opens a "sound test" screen where you can play each of the game's songs and sound effects. Each song also includes a title. Press Start to return to the previous screen.
• FONT — Switches the font out with a slightly larger one that fills more of the 8x8 tile space. Enter the password again to switch back to the default font.
• MODE — Opens a "setup" screen, allowing you to set the number of remaining lives (0~7), difficulty (0~3), and change the in-game colors to a "negative" version.
• MAPS — Opens a "map select" screen.
• XENA — Allows you to choose levels A, B, and C.

(Source: @yamada_arthur)