Don't use all caps, it makes you look simple.

Mileena:
22264 22264

Classic Sub:
81835 81835

Ermac:
12344 44321

And remember, you need to use both the Player 1 and Player 2 controls to enter the code. The "slots" on the UKK screen go like this:

P1HP, P1LP,P1BL,P1LK,P1HK,P2HP,P2LP,P2BL,P2LK,P2HK

Think of the button layout as a "W;" that can help you remember which button does which.

And yes, lay off the caps lest you incur the wrath of Crow!

i tried the ermac one twice and its not working but i ́ll keep trying (i asked here because i toth i gad the wrong kodes) and its very expensive to be playing and not getting it right (r$ 1,32)
ps: there are only 3 ultimate kombat kodes?

Yup only 3 kombat kodes to unlock the 3 hidden characters. After they are all unlocked the screen to enter kodes doesn't even show up any more.

thanks guys i unlocked all the crachters , and just wnted to know if there is any more cheat to use secret karachters and stuff

In case you arent familiar you can play as Human Smoke by choosing Robo Smoke and then holding HP+HK+BL+RN+away(left if you are P1 or right if you are P2) before the round starts and right before the round starts you will explode and become Human Smoke. That's pretty much the only other hidden thing. You can use Mame cheats to play as Noob as well, but there is no way built into the game to do that.

thanks dude i knew about the human smoke thing but i haven ́t tried yet, gonna do it today in the arcade , unfortunately human smoke doesn ́t get unlocked in the character list