Players use inductive logic to determine a secret rule. One player is the Moderator and knows the rule, the rest create structures to test their theories about the rule. This game is an excellent model of the scientific method and experimental design. Developmentally, inductive logic develops at about age 12 regardless of intelligence level, so this game is for 2-6 players ages 12 and up. Includes 164 pieces, 40 cards, and 2 rule books (basic and advanced).