Mortal Kombat: Shaolin Monks

In the MK2 arena level (right before the portal with the two statues in front of it) in the evil monastery, You will see many pillars. Jump on one of them which is half broken and then double jump onto the roof. You will find the secret there.

To unlock Mortal Kombat II enter Square, Up, Down, Left, Right, R2, Square, while holding L2 in the main menu.

Complete all 5 Smoke Missions to unlock the MKII arcade game.

Living Forest. Go to the section after the Brotherhood Of Shadow. Long Jump across the gap with the tiny waterfall. Go through the door. Now, get the Clay Statues to come to life. Destroy their shield. You only need 1 of them. Now, get
one of them over near the Giant Stone Cloumn on the other side of the stream. It's the stone column right near where you entered. Throw the Clay Statue into it! It should come crashing down. Now, return to where the little waterfall was. There is no longer a waterfall. Just a Koin that contains Reptile.

To unlock Scorpion hold L2 and press Square, Up, L1, R1, Right, Left, Square while in the main menu.

In foundry follow the pathway downstairs to the left of the save station. Two archers will bust through the wall. Throw one at the wall to the left of the door way and it will bust open revealing a secret room full of lava and a ying yang on a
ledge. Grab one of the archers and throw them in the lava. Then double jump off the guards back to claim the Scorpion ying yang for VS.

To unlock Sub-Zero hold L2 and enter Square, Down, Up, L1, L1, Up, Square in the main menu.

After the boat ride across blood lake, his VS. icon is in back of the lion taking looking statue to your left (facing the big door), just run along the wall and when you get to the end double jump and its yours.

At the beginning of the game when Johnny Cage says "Liu, this way", if you are someone else besides Liu Kang he will still say it.