From the introduction: Highwall Inn is a scenario for Chaosium’s HeroQuest Glorantha role-playing game. A copy of that book is necessary to play this game. No other HeroQuest game titles are required to play this game, but Sartar: Kingdom of Heroes and The Coming Storm expand upon the background of this scenario. This scenario is the HeroQuest Glorantha scenario for #weareallus, the inaugural Greg Stafford memorial day. Greg created the world of Glorantha and founded Chaosium. On this day we hope that you will gather some friends and play a game together in his memory.