Twice Dice (Full set 6 Die each missing 1 number between 1-6)Twice Dice are also known aselimination dice or one way tops. One number has been replaced by another. For example the Double Four has an extra 4 instead of a 3, and the Double Five has an extra 5 instead of a 2. The extra number is on the opposite face to its double, so they are never visible at the same time. Only a close examination will give the game away. Magicians use these dice to force a predetermined outcome. Role playing gamesters use them