Crack your code first! You can see your opponents' codes but not your own. Using questions plus logic, try to deduce which three numbers are hidden in front of you. Once you're reasonably sure, you can make your guess!
Each player will take a turn drawing a Question Card, and then answering the question based on what they see on the other players' racks. Each answer gives everyone, except the reader, a bit more information.
If a player thinks that he knows the numbers on his rack, he can guess his code, scoring one point for a correct solution. The first player to score 3 points is the winner!