T1-4: Temple of Elemental Evil
The Temple of Elemental Evil is one of the most famous Dungeons & Dragons adventure modules in the world, after the Tomb of Horrors. It's an epic dungeon delve that revolves around the players breaking into the combined dungeon-temple of the Cults of the Princes of Elemental Evil - the four Archomentals Ogremoch, Imix, Olhydra and Yan-C-Bin, being ultimately manipulated and controlled by the cult(s) of Zuggtmoy and/or Tharizdun. It has received multiple different iterations across different editions.
A 3rd Edition Dungeons and Dragons based video game version was released in 2003. It is best known for having the most accurate adaptation of 3E rules to a video game and being an excellent example of turn based combat. Tim Cain actually owns the rights to the source code for it and Arcanum and wants to release it, but his contract won't let him because it would allow for bypassing the CD check DRM that was broken the week it came out and sold without since 2010.