The simple answer is: You can't. This is because (assuming you mean "Call of Duty", COD, Nazi Zombies) you will need the game. However, nazizombies.com has lots of tips tricks and strategies to do with Nazi Zombies, along with polls, for free. If you really want to play the game online i would suggest buying it for PC and/or Mac, depending on which you have. Places like "Steam" "Game" and "Gamestation" will let you buy the game online and download it. Then you can play it online without any extra charge. If you want to play it on a different platform (PS3 / XBOX / Wii) then you will need to go and physically buy the disc (PS3 and Xbox have online stores, so you could buy it there). If you are playing it on Xbox you will have to pay the charge for Xbox LIVE. This varies depending on which band you buy (more information can be found at xbox.com/en-GB ( or US) then click on Xbox LIVE.

Well you can play it on computer only its got a different name zombie  asolt

Really? Nazi Zombies is part of Call of Duty: World at War. You can play it on the computer only if you have bought the game. There is no internet version. Just stop.

You can only do it on pc mac xbox360 and iphone last ps3

If you have an ipod you can get it on itunes

Well you can play on your pc or look it up on the computer

You can play it free on any console, unless you want online then it cost I think $90 per year on the 360 or you can play free online on PS3

I don't think it's possible, but COD WAW is on steam for $29.99 right now, so maybe just buy the game?

Ive been trying to do it for 7 hours I don't thunk its possible

Ps3      xbox360    pc

yes but you have to download it

You can't sorry evry body if you can find out tell me

Dude I asked the same thing

On call of duty 5

Buy World at War for pc