You Don't Know Jack is a video game developed by Starsphere and published by Sierra Attractions for the PlayStation in 1999. A European release followed under Take-Two Interactive's Rockstar Games subsidiary in 2001, which was released exclusively in Germany.
The game received favorable reviews according to the review aggregation website GameRankings. Chris Charla of NextGen said, "With support for three players (the multi-tap is supported, but three can play with two controllers) and two discs of questions, this game should rival PaRappa as one of the best PlayStation party games around." Some other magazines gave it favorable reviews months before the game was released Stateside.