The first version of these rules Hero Wars was published in 2000 (ISBN 978-1-929052-01-1)
The second version HeroQuest was published in 2003 (ISBN 978-1-929052-12-7). We refer to this as HeroQuest 1e to disambiguate.
The third version HeroQuest: Core Rules was published in 2009 (ISBN 978-0-977785-32-2). We refer to this as HeroQuest 2e.
HeroQuest Glorantha was published in 2015 (ISBN 978-1-943223-01-5). It is the version of the rules in HeroQuest 2e, presented for playing in Glorantha. We refer to this as HeroQuest 2.1e.
QuestWorlds was published as a System Reference Document (SRD) (this document) in 2020. The version of the rules here is slightly updated, mainly to clarify ambiguities, from the version presented in HeroQuest 2e and HeroQuest 2.1e. This makes this ruleset HeroQuest 2.2e, despite the name change. However, to simplify we identify this version as QuestWorlds 1e.
An Appendix lists changes in this version. As the SRD is updated we will continue to track version changes there.