Final Doom

Start your game in the mode and difficulty you want the press start to pause the game.
You might have to put these in two or more times to get them to work. I think you have to put them in at just the right speed.
down,l2,square,r1,right,l1,left,circle     (God Mode)
X,triangle,L1,up,down,R2,left,left         (All Amo,Guns,armor)
L1,R2,L2,R1,right,triangle,x,right         (X-ray vision)