My left or yours?: Hold on to your planet!

"Who should you call if Earth starts spinning uncontrollably toward the sun? Here's a hint: He's an uncle and a grandpa, and no one knows how many thumbs he has. It's this guy! Uncle Grandpa! Solve the riddles, puzzles, and codes in this wacky outer-space story to help Uncle Grandpa and his crew save the world from certain doom. Every decision leads to a different story."--Page [4] cover.