"huh?" is a game about Boolean logic. It is played with two kinds of cards: "pattern" cards which each have a Boolean function, e.g. "(a or b) and not c," and "epsilon" cards which each contain three out of a set of six letters. Five games are provided, each of which works the same way: some number of patterns are provided and each player substitutes some of the six letters into one of the patterns to make their secret function. Players take turns selecting an epsilon card from a display and asking another player whether their function produces the result true or false for that card. The object is to be the first to deduce another player's function. There are also two "pregames" to get players used to Boolean functions.