Black Ops: Kino Der Toten

I know theres a Black Ops thread already somewhere but it’s been going forever and I’m sure my question will get buried so here it goes:

What’s the deal with the Zombie levels? There are three of them but I can’t seem to unlock the other two. I’ve scoured teh interwebs for advice on beating Kino Der Toten, but it doesn’t look like you’re supposed to beat it you just keep climbing in rounds.

If not, then how the are you supposed to unlock the other Zombie levels.

In the main menu, when you’re looking at the TV screen with the options to select, click the left and right triggers for a bit (I’m talking Xbox 360 here, don’t know what you might be using). Your character will stand up out of the chair and you can move around the room. In one of the corners is a computer terminal … I believe you click A to start using it (the instruction is on the screen).

There you can enter all sorts of codes to do all sorts of things, like reading LBJ’s private electronic messages and such. But what you want is the zombie modes. Enter 3ARC UNLOCK. That will unlock the Pentagon zombie level “Five” (worth it for the opening cutscene alone … I love how JFK says “Zombies” like it’s no big deal) and the top-down arcade zombie level.

You can also enter ZORK to unlock the old text adventure game Zork I. Here’s a complete list of the unlock codes.

That’s awesome, thank you. Without the codes how are you supposed to unlock the other zombie levels?