Zynga's charity campaign "Oh, What Fun!" runs today through December 31, with 100 percent of select, holiday-themed in-app purchases in seven games directly benefiting Toys for Tots.

Participating games are CityVille, CastleVille, Words With Friends, Pioneer Trail, Bubble Safari, Draw Something and FarmVille, each with specific items to purchase for the charity, such as FarmVille's cheer-ewe-up horse for $1. As always, we're happy to see Zynga isn't sheepish about using puns. We're laughing so hard, there's a cramp in our calf. Sorry, we're really milking this one.

Some of the items have time limits within the charity drive, with FarmVille's ending on December 5 and Pioneer Trail's not beginning until December 17. Check out the full list of games, items and timeframes after the break.