sure I'll tell you but I only know about shaolin monks. At the 'Main' menu enter the following codes to unlock characters and modes

Unlock Sub-Zero for Story mode:
Hold L2 and input Square, Up, Down, L1, L1, Up, Square. Then release L2.

Unlock Scorpion for Story mode:
Hold L2 and enter Square, Up, L1, R1, Left, Right, Square. Then release L2.

Unlock Classic MKII mode:
Hold L2 and input Square, Up, Down, Left, Right, R2, Square. Then release L2.

this is how to unlock characters: for unlocking johnny cage
In the wu-shi academy where everything is burning. Go to the very right of the gate and jump onto the roof of the house. Run to the right and jump. If you did it correctly, you will be on a new platform with a boulder blocking your way.

unlock kitana
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.

unlock Reptile
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.

unlock baraka
In the soul tomb portal, got to the area where you have to wall climb. You will see 2 paths. One leads left, the other right. The right path has a statue. Use fist of ruin and break it. Keep going and use the long jump ability across the gap and you will get him.

others

How to unlock the arena between the Dead Pool and The Living Forest.

To get the Kombat Tombs you must go to the entrance of the Soul Tombs, when you get there go into the room nearest the statue, you must throw 3 enemies into the 3 Iron Maidens (the spike walls that slam shut) and The Kombat Tomb Koin will appear

Kombat Tomb Arena (Vs. Mode) Throw 3 Enemies into the 3 Iron Madiens in the Soul Tombs

Rescue Kabal and get his Hookswords

In the Wastelands, there are two doors that are covered with human bodies. One leads to the Elemental Warriors, the other is an area where Shokan warriors are throwing boulders at you. Go though the second door. Simply avoid the boulders and climb the ladders until you reach the top. There you will find Kabal inside a cage. Once he is freed, he will leave his hookswords as a sign of gratitude.

To access Survival Mode, you must be at the Foundry Stage. While holding the forged axe, walk back to the main chamber where you first found the save point. Walk down the corridor to the back and break away the wall on the left-hand side. Jump into the pool of lava in this room, then go back to the main chamber. Walk the path to the right of the save point and destroy the right-hand barrel at the end of the corridor. From here, go back to the main chamber, walk up the stairs to your left and move towards the barrels you see in the area. Be careful to only break the one on the right-hand side. Go back, but instead of going down the stairs again, keep hard to the right. There's a niche with two more barrels. Break the one on the right. Go back to the left and down the hall with the spike crushers falling overhead. When you past them, break the barrel closest to the right-hand wall. Return to the niche to break its last barrel, then back to break the remaining barrel just over the stairs. Survival Mode is the Boss Rush Mode of Shaolin Monks.

After Goro dies and Kung lao argues with Kang, wait until Kang is hit and morphs back into Shang Tsung. At the point that Tsung is green from being half-morphed, skip that cut-scene and when it returns to normal game-play, your character will be invisible and only his shadow on the ground will be visible.

Easy 1000 Exp Points!

First obtain the combo ranking of "Toasty". Then immediately press the start button. The words "Toasty 1000" should appear in the middle of the screen and you will be awarded 1000 exp points. The best thing about this trick is, it works every time.

Fight Ermac, Kano, and Mileena!

To fight Ermac, you need the Fist of Ruin and Swing Ability. Go to Wu Shi Academy and go to the first area of it. Once you're there, look for the big red bridge. Before this, there is a split path. Take the one going over a chasm of spikes. On the other side is an evil Priest statue. Break it and head into the new area. Once you're there, jump onto the area to the left. Use swing to get to higher ground, then interact with the statue. The doors on the other side of the bridge in this area will open, and you will see the Warrior Shrine.

Go to the Warrior Shrine, and examine the statue on the left three times to fight...Ermac!

Near the end of the game, right before you fight the final three bosses, talk to Kitana three or four times. Destroy the guards that come into the room, then go through the new door to find...Kano!

In the first area of the Living Forest, use the swing ability on the two big branches that can be found above you as you head for the save structure. Swing over to higher ground, then climb up the ladder. You will be in a new area. Head to the other end of this treetop area to fight...Mileena

there that all i know

I know al lot about it send me a message If you need me