The puzzlers in this book are seemingly simple examples of Scala code that exhibit highly unexpected behavior. In the manner of Java Puzzlers, the reader is challenged to guess the correct outcome from a number of possibilities. This is followed by a detailed discussion of the reasons underlying the code's actual behavior, as well as the Scala language and compiler features in play.Working through these code examples and the subsequent explanations will provide important and often fundamental insights into Scala. Get ready for a fun journey that will take you further down the road to Scala mastery.