FAQ: Doom II for GBA

NINTENDO GAME BOY ADVANCE DOOM II
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o Cheat codes (entered while the game is paused, and L and R buttons held):

  A A B A  A A A A: Invincibility on (cannot be toggled off)
  A A B A  B B B B: Invincibility off (cannot be toggled on)
  A B B A  A A A A: Gain 3 keys, all weapons, backpack, full ammo, 200% armor
  B A A A  A A A A: Gain Computer Area Map item (cannot be toggled off)
  B A B A  A A A A: Gain Berserk Pack (cannot be toggled off)
  B B A A  A A A A: Gain radiation suit (cannot be toggled off)
  B B B A  A A A A: Gain Invulnerability Artifact (cannot be toggled off)
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  Notes: To use codes, pause the game, then hold down the L and R buttons (on
  the top edge of the GBA) while tapping the buttons for the desired code; then
  un-pause.
  Once invoked, the "Invincibility On" code (AABAAAAA) cannot be toggled off,
  and will remain in effect until the "Invincibility Off" code is entered, or a
  new game is started, or the Game Boy Advance is powered off.
  Invincibility status is preserved in saved games.
  The "Computer Area Map" and "Berserk Pack" codes cannot be toggled off.  Each
  item will remain in effect until the player leaves the current map level.
  The "radiation suit" code, and the "Invulnerability Artifact" code (BBBAAAAA)
  cannot be toggled off.  Each item will remain in effect for the item's normal
  duration, or until the player leaves the current map level.
  All cheat codes are disabled in Deathmatch and Cooperative games.

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