THE DEVIL:
A “devil’s number” occurs when three 6’s and any one other number are rolled (for example: rolling three 6’s and one 5 would be called a devil’s five). A devil’s number may look similar to an odd man out, but it is not resolved in the same way.
Instead, the number that is not a 6 becomes the devil’s number and is considered to be cursed. The curse takes effect immediately and prevents the devil’s number from being used in any scoring, or re-rolls for the player who rolled it until the end of their next turn.
Alternatively, you may sacrifice one point (if you have any points available) to make a “deal with the devil” and prevent the devil’s number from becoming cursed. (This would allow you to score a devil’s four or re-roll the false four created by a devil’s two.)
Four 6’s is considered four of a kind, not a devil’s six.