There's a little special on Call of Duty: Black Ops II over on Steam where you can play the multiplayer component for free all weekend long. Yup, you have full access and not only that, the game is 33% off on Steam right now. You can pick it up for $40.19, or nab the Digital Deluxe Edition that contains a bunch of extras for $53.59.
Plus, Black Ops II is having a Double XP weekend starting on May 10 at 10:00AM PDT, till May 13 at 10:00AM PDT. That goes for all platforms: Xbox 360, PlayStation 3, PC, and yes, even the five of you playing the Wii U version.