Ten-question trivia rounds separated by ten-minute breaks. I think that the chat combined with the breaks was the secret sauce - short enough to convince yourself to stick around, long enough to have meaningful conversations with fellow players. Early on a culture of sharing answers quickly developed. Some elements of randomness were thrown in, like the scoreboard getting scrambled so you wouldn't know who's winning, etc. It wasn't much TBH, but an opportunity to meet interesting people from all walks of life.
