Peetan

Peetan
Developer: Inter State Software Publisher: Kaneko Platform: Game Boy Released in JP: December 27, 1991 This game has unused text. This game has a hidden sound test. This game has a hidden level select.

Peetan is an uncommon Japan-only Game Boy puzzle game about a hen saving her chicks from a wolf.

Leftover Development Text

At 16C43 above the sound test text is the string "NON PROGRAM!".

(Source: Torchickens)

Sound Test

Press Up, Up, Down, Down, Left, Left, Right, Right, B, A, Select at the title screen.

Round Select

Press Up, Down, Left, Right, B, A, Select at the title screen, then start the game.

(Source: Makainyumon)