Black ops: easter eggs

I was playing Black ops earlier today, and I found some really cool easter eggs. I was at the main menu of the game, ( where you get the choice to choose campaign, multiplayer, zombies, or options,) and I broke free from the torture chair. ( In case you don't know how to do this, you have to tap the left and right bumpers at the same time, for a few seconds.) You then can get up and run around in the small area. Note: You can get an achievement from breaking out of the torture chair. If you run to the computer behind the chair, there are a number of codes you can enter. I will list the codes and what they do if enter them right. #1: Zork: unlocks the classic game of basic commands. For example: you find a Troll, you can do command: attack Troll. you get an achievement called eaten by a grue by entering this code. #2: 3arc unlock: Unlocks all levels from the story mode, zombie maps, and the game type dead ops. ( You get an achievement for starting a game of dead ops.)  #3: 3arc intel: Gains you all the intel in the game, but you do not get the achievement for getting all the intel. #4. doa: unlocks dead ops arcade. That is all for now. Please comment and follow for more posts like this one! Thanks for reading, and have fun playing with the codes!