Here's a look at a Role-Aids product from Mayfair Games. Published in 1983.
The wizard Fez has faith in the abilities of adventurers. But Mephistopheles isn't as confident. So a pact was made between the wizard and the demon. As each bargained madly to outdo the other's bet, Fez was trapped in a magical sleep. More than just a wizard's pact is at stake as you strive to accomplish the seven "impossible" tasks.