Preface It's common knowledge, that Troika's Temple of Elemental Evil game was PC implementation of adventure module in Greyhawk campaign setting. (wiki). The module itself, was combination of "The Village of Hommlet" (T1) module, which ended after clearing moathouse, and unpublished T2, T3 modules which merged into single T1-4 module of ToEE. The module is based on 1st Ed AD&D rules (link). Because Troika's ToEE is 3.5 rule game, the module was updated to 3.5 version rules. DnD_ADD_T1-4_Temple_of_Elemental_Evil_(1e).pdf But setting, story, NPC and monsters and most notably maps - were almost true to original Greyhawk ToEE module. The word "almost" is key to this post. Let's look of what is different.