Codes work in non multiplayer modes only.
While playing a game, enter one of the following codes to activate the corresponding cheat function. Rather than putting yourself in harm's way by opening doors with your ship or with ammo or energy, use flares to open them. When cloaked, turn off your headlight and don't use your afterburner, or you'll give yourself away. Use the guided missile to scout out areas ahead of you or to attack particularly difficult enemies from a safe distance.