After the prepare for combat screen press x,o,triangle R1 R1 R2 R2 R1 R1. 
Then you will here YOU WILL NEVER WIN from SHO KHAN.Then press start. 
At the combat cube press up. This will give you six options.

Smoke code: 
At the credit screen in the beginning do a full circle on the controller. 
Then at the UK code screen type R1 once, Triangle 6 times, circle 9 times, 
and last X 6 times.

After the prepare pourself for Kombat screen put in x,L1,L2.

At the Raiden Screen press,triange,square,circle,x,L1,L2 you 
will hear a sound. When you get to the Kombat Cube Press up and 
prepare for a surprise.

freeplay: u, u, r, r, l, l, d, d at the raiden screen

smoke: do 360s on raiden screen enter ukk as 010696

4 option: x, l1, l2 on raiden

6 option: x, o, tri, r1, r1, r2, r2, r1, r1 at the raiden screen press up on 
kombat box to access cheat