Moss: Book II is an action-packed platformer with a unique twist. The story begins where it left off in Moss: Book I. You are a young girl named Quill who is being held captive in a strange, hexed castle by a twisted, evil wizard. Your uncle Argus is the only person who can get you out of there, but he is captured by the wizard and locked away.

The goal of the game is to help Quill rescue her uncle and escape from the castle. You will face off against twisted enemies, puzzles, and traps in your way, but new allies and old friends will come to your aid.