Doom: Mars, and the gateway between its two moons, Phobos and Deimos, has been the site of inter-dimensional space travel testing. Recently, however, these passageways have become dangerously unstable. Experiments using humans as guinea pigs have met with tragic results. Something evil has been exiting the gateways. As the only combat-ready assault troops within 50 million miles of Earth, you, along with your buddies, have been ordered to Phobos. You arrive and are assigned to secure the perimeter of the base while the other space marines go inside. From outside the base, you hear the carnage: guns firing, men screaming, bones cracking... then silence. Suddenly you're the last space marine alive, thrust into a bloody, gore-ridden underworld. Packing everything from chainsaws to rocket launchers, it's up to you to annihilate Imps, Lost Souls, Demons, Barons of Hell... and ultimately avenge the brutal slaughter of your men. The ultimate deathmatch. gameboy-advancecheat-codesdoom

Cheat Codes God mode Pause the game, then hold L + R and press A(2), B, A(5). All weapons, items, keys Pause the game, then hold L + R and press A, B(2), A(5). Invincibility Pause the game, then hold L + R and press B(3), A(5). Berserk mode Pause the game, then hold L + R and press B, A, B, A(5). Computer map Pause the game, then hold L + R and press B, A(7). Radiation suit Pause the game, then hold L + R and press B(2), A(6). Advance levels Pause the game, then hold L + R and press A, B, A(2), B(2), A(2). You will advance about 5 levels, depending on the current level. Tower Of Babel level Pause the game, then hold L + R and press A, B, A, B, A, B(2), A. Hidden Military Base area You can find this area in the Toxic Refinery (Episode 1, Level 3). Complete the first half of the level (before you enter the blue door), then go back to the starting point. Look inside the pool of radioactive waste and you should see a platform (if you flipped all the switches in the first half). Walk across the platform towards the wall it leads to. The wall will open and you will have to defeat a series of enemies. Explore the secret area more and you should find an exit door. Enter it and flip the switch (the stats will not appear). You will now be an area called the Military Base. Note: This area can be very difficult.