you can't officially "Win" but you can get to as high a level as possible, to achieve a "high score". A good way to do this is to make it to the 'Random box' location and get a good weapon. After you do that move toward the rocket launch area? were the pack a punch machine is and upgrade your good weapon. This will insure many rounds of survival :D have fun killin Zombies... haha.
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you need to buy it
You do in Ascension zombies from the first map pack for black ops.
Only Ascension has a round limit, 50. All others go on forever exponentially.
There is no code for ascension. It is the zombie map in the first strike PS3, Xbox 360, & PC dlc sold for $15 or with the limited editions Call of Duty Black Ops for those game versions
u have to wait till the firdt drike map pack comes up in the PS store then u purchase the map early march.