Challenge System

The highest level is 50 and Prestige Mode will return.
There are 15 levels of prestige.
In the Black Ops rank system, the player must level up to unlock weapons for purchase.

 By completing challenges, you will get "Money", and with it you will be able to buy, weapons, perks, camo, ect .In addition to this, players are also allowed to wager these points in certain game modes. 

Contracts System

 Contracts are a new system in addition to the classic challenge system in Black Ops. A player is able to buy a contract with CoD Points, which will then direct them to complete an object. Completion of a contract will yield a higher CoD point payout than what was originally paid for the contract itself.