In training mode press R 2 choose any level
In classic kombat press SEL 2 choose handicap

(Note: this code only works for unchained. Not likely to work on deception!) To unlock kenshi's alternate coustume in konquest, after you pass through the gates, turn your camera around back to the locked door. You should see a chest. Oppen it, then take the key to the krypt, and unlock the coffin. You should see kenshi's Deadly Alliance costume.

To see a free no code fatality, you must First start up a Chess Kombat and select the fighter that you would like to see his/her fatality, build the rest or your team and start the match.
Then select the spell menu and select exchange one of your champions(the one on the
Left or right of your leader)and the other teams shifter(the one on the farthest upper left or right)then it will be the other teams turn and the shifter WILL attack your leader. The shifter will change into your fighter. Let the enemy kill you and the enemy will perform a fatality and since the enemy is a shifter you'll see the "leader" warriors fatality
This also works on MK Deception

1)foward, back, foward, back, square
2)foward, down, foward, foward, square