Scala Exercises is a web based community tool open sourced by 47 Degrees. It contains multiple koan and free form style exercises maintained by library authors and maintainers to help you master some of the most important tools in the Scala Ecosystem. Version 2 comes with a brand new backend and exercise tracking where you can login simply using your Github account and track your progress throughout exercises and libraries. Version 2 will launch with exercises for the stdlib, Cats, Shapeless and other well known libraries and frameworks part of the Scala ecosystem.