GameBoy/GameBoyColor Duke Nukem
BUTTON COMBINATION CHEATSINVINCIBLE On the title screen, press: Up, Down, Down, Left, Right, Left, Up, Up LEVEL SELECT On the title screen, press: Left, Right, Up, Up, Down, Up, Right, Left
BUTTON COMBINATION CHEATS
INVINCIBLE On the title screen, press: Up, Down, Down, Left, Right, Left, Up, Up
LEVEL SELECT On the title screen, press: Left, Right, Up, Up, Down, Up, Right, Left
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