You can't.
Any hacks are immediately patched out of the game.
Treyarch recently got into a deal with Sony. From now on, people who hack or mod games on Black Ops or other Call of Duty titles will be banned from the game (as usual) - but Treyarch will also pass your details onto Sony Entertainment Network Security Team as part of the new deal, because Treyarch are rewarded financially by Sony for every hacker/modder they report. Sony will then block the person entirely from the Network and insert a cookie that cannot be deleted into your Playstation system which wipes out all of your achievements and blocks your console from ever connecting to any Playstation network. To get around this type of ban, you'll have to buy a completely new playstation console.
Being banned by Sony is expensive.
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Open the console and type sv_cheats 1 noclip If you plan on using it a lot, bind the noclip command to a key so you don't have to keep typing it in.
To be in noclip in Minecraft, you will need to turn on your fly mode, and press the button that you set it on. Except some severs have some blocking thing that can block you from using fly mode.
You need an internet connection to play online only
normally you would press "V". but if that is not working, go into the console and type: Bind v "noclip" . That should fix it.
No, it is not possible to return to tutorial island once you teleport off of it. Unless you have the glitch noclip which then allows you to walk on water