Battlezone Cheats
     Go to options, then go to the cheat menu. select one of the cheat
options  and  then  just  type in the code. You just have to move your
cursor over a cheat option to select it. If the code is successful you
will  hear  a  sound  and there will be a "on" icon appear next to the
code. When done make sure you press "X" rather than"O" or else all the
cheats will be turned off.

Password                                    Effect
->, ->, <-. square, R1, L1                  Team special recharge
Triangle, L1, square, square, ->, <-        Mortar only
L1, sqaure, triangle, ->, triangle, R1 	    Insta gib
<-, R1, L1, triangle, ->, square 	    Unlimited ammo
sqaure, ->, triangle, ->, R1, L1            Pick up double time
start, ->, <-, select, ->, sqaure           No auto heal
L1, <-, ->, square, triangle, R1            Always invisible
->, <-, ->, <-, ->, <-                      Max players