To access these cheats do the following:during gameplay press start and enter the cheats as seen below.
Invincibility-L2,R1,L1,R2,up,down,up,down,select,select
invisibility-L1,R1 (5 times)
double duke-L2,R2 (5 times)
all keys-up,right,up,left,down,up,right,left,right,down
all weapons-L1,L2,up,L1,L2,down,R1,right,R2,left.
unlimited ammo-left,right,left,right,select,left,right,left,right,select
special weapons-R1,R2,L2,L1,R1,R2,L2,L1,select,select
ride a motorcycle-L1,R2,R1,R1,R1,L2,L1
(hint)If you enter the code correctly it will say it on the top and make a splash type of sound.
For example, if you put in invincibility correctly on the top of the screen it will say invincibility and it will make a splash type of sound.
We have more cheats and tips for this game here, Duke Nukem: Time To Kill cheats
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