Space Invaders Cheats for GameBoy Advance

Press Start at the title screen, then press B, A, Select(2), B, A, Left(2). A cheat menu with level select and permanent shield will be unlocked.

Press Start at the title screen, then press Left, A, Select(2), Up(2).

Press Start at the title screen, then press B, A, Down, B, A, Down, B, Up, Select.

Enter CLSS 1281 999DBM as a password.