Steam tell us it's MP only for this
Steam has COD:blops2 for its F2P weekend - with 33% off - for £26.79. Which seems better than Amazon's price for it.
Can you play the single-player campaign on these F2P weekends or are you restricted to Multiplayer?
I like your thinking though
Play the multiplayer version of the game for free until Sunday at 1PM!
Click here to download and start playing.
Must have Steam installed.