Challenges are a big part of what makes Call of Duty such an addictive multiplayer game. They're back, but now there are Contracts to top them off. These are rotating challenges offered by Treyarch, changing every day or week. To partake in them, you'll have to pony up a few COD Points to buy the Contract. Complete the challenge and you'll win extra points. There is a catch -- each Contract has a time limit. I bought a low level one that required you to get three SMG kills without dying in less than 40 minutes of game time. It cost 50 COD Points and, upon completing it, I received 250 back.
Fail at completing a Contract and you'll have to wait at least 24 hours to try again. And you'll be out of some COD Points.