Somewhere in The Fairground of Dread is the laboratory of mad Professor Killjoy. Your task is to find it and stop him releasing his deadly anti-laughing gas. But beware! Wild animals, mechanical monsters, death dodgems and many other dangers await you! Your mission on The Planet of Terror is to find your crashed spaceship, the Homestar, and return to Earth. But first you must outwit deadly Tentaclons, ghastly Mutoids, the evil Brain of Terror and other terrifying dangers! There are lots of different puzzles to solve in each book - mazes, spot-the-difference, hidden objects - and many different routes to choose so you can play these games over and again.