When Scooby-Doo and the gang arrive at Professor Dinkley's archaeological dig in Mexico, they find Velma's uncle missing, and the workers terrified of chupacabras and Aztec gods--and the reader must help them solve the mystery.
When the gang drives out to Bushytail Farm to visit a friend, they find their friend missing, an unfriendly caretaker and zombies wandering around the farm--and the reader must help them rescue their friend and find out what is going on.
Scooby Doo and the gang are on the Magical Mystery Cruise, through the Bermuda Triangle, and the reader chooses which mystery to pursue--dangerous criminals, confused passengers, or a real ghost.