Freerice.com is an interesting game, particularly in light of me highlighting Questionaut before. Not because Freerice is for charity (I have no confirmation whether it is real or not), but as an example of how taking a rather banal but important skill, studying vocabulary, and making it fun. A broad challenge set tailored to each player, a satisfying reward, simple presentation with direct usability, fast replayability, and a game with multiple skill dimensions (related words and good guessing skills really help!) make this game stand out again. We had quite a good time playing co-op too. What more can you ask?