This is a single die for forcing a specific number. It's been cleverly made to hide the secret well.
Imagine six envelopes, each numbered one through six. This die will force a certain number. Thus, the money would be placed in that "number envelope." A spectator can be made to win or lose depending on how it is presented. When a number is rolled, then that "number envelope" is destroyed. Through the process of elimination, the spectator will ultimately choose your desired number.
