Doom Cheats (GameBoy Advance)

Press Start to pause gameplay, then hold L + R and press A, B, B, then A five times.  This
code gives you all weapons, items, and keys.

In single player games, press Start to pause gameplay, then hold L + R and press A, B, A,
A, B, B, B, A.

Press Start to pause gameplay, then hold L + R and press B, A, B, then A five times.

Press Start to pause gameplay, then hold L + R and press B, B, B, then A five times.

Press Start to pause gameplay, then hold L + R and press A, A, B, and A five times.

  To disable God mode, press Start to pause gameplay, then hold L + R and press A, A, B,
A, and B four times.

Press Start to pause gameplay, then hold L + R and press B, then A seven times.

Press Start to pause gameplay, then hold L + R and press B, B, then A six times.

In single player games, press Start to pause gameplay, then hold L + R and press A, B, A,
A, B, B, A, A. You will advance ten levels, depending on the current level. Note that
there are only twenty four maps in single player games; therefore this code will not work
when starting from maps higher than 14, "Halls Of The Damned."