The twist in P.I. is that each player has their own case to solve, with the player to their right knowing what case that is. Thus as well as being told when a fact is correct you are also told when you are close to being right. The game is divided into three mini-games, each one taking about 15 minutes to play. P.I. is low on rules but high on mental challenge. If you love problem solving then P.I. is the game for you.