I've got a perhaps irrational fondness for trivia games. It's easy to like the genre when your brain is filled up with seemingly disconnected facts; trivia games give them a place to go. A tiny little factlet purpose in life.
One of my favorites is You Don't Know Jack, the intentionally irreverent trivia game. Once seemingly doomed to be a relic of the 1990s, YDKJ recently had a comeback on consoles and as a really great example of how to do a Facebook game right. It's somewhat amazing that the franchise works at all: timely humor is hard, and what was funny fifteen years ago may feel forced and dated today.