Doom Hints for Gameboy Advance
To be a zombie unlock lvl 4 and collect the zombie head !
Gives 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 serious of enemies.Explore the secret area more and you should find a exit door.Enter it and flip the switch(the stats will not appear).You will now be in an area called the Military Base.