The "HeroQuest" game system, written by Robin Laws in collaboration with Greg Stafford, is radically different from "RuneQuest" in that it emphasises narrativist aspects of role-playing; in contrast, "RuneQuest" emphasised simulationist aspects. Because of this change in approach some "RuneQuest" fans found it difficult to adjust to "HeroQuest". However, other long-term fans felt that the game fit Glorantha far better than "RuneQuest". A rewritten second edition was published in Spring 2009 by Moon Design Publications, and is being supported with comprehensive Gloranthan sourcebooks: "Sartar: Kingdom of Heroes" (2009), "Sartar Companion" (2010) and "Pavis: Gateway to Adventure" (2012).