Adventure Workshop 4th-6th Grade 9th Edition" /> Use your thinking skills to help the ClueFinders save a mysterious planet from the grasp of Malicia! Carmen Sandiego has run off with a rare novel! Now it's your mission to travel the globe, track down the elusive thief and return the stolen treasure! The clock is ticking and you only have until midnight to stop master of mischief Morty Maxwell and his reckless robots from turning the school invisible! Travel to a math metropolis where super smart super heroes help you build math skills with brainteasers, games and more!