Go to the OPTIONS menu and hold Up + L + R until the screen shakes. This
should allow you to access the green ? mark menu. Here you can enable
one button fatalities, normal boss damage and a few other cool tricks.
To play as Chameleon,choose any "masked" male ninja. After you have
chosen your destiny, hold Away, then press and hold Run + Block + High
Punch + High Kick. When your match starts your male masked ninja should
turn into Chameleon.
To play as Jax and Kung Lao from Mortal Kombat II or Rayden and Kano
from Mortal Kombat, highlight their character on the Player
Select screen and press Start.