Eye of the Beholder II: The Legend of Darkmoon

"Eye of the Beholder II: The Legend of Darkmoon used a modified version of the first game's engine, added outdoor areas and greatly increased the amount of interaction the player had with their environment, along with substantially more 'roleplaying' aspects to the game. The Legend of Darkmoon is generally considered the crowning success of the trilogy, compared to the (considered by many) disappointing sequel, Assault on Myth Drannor.

The Storyline: After the adventures of the first game, the heroes head to a local inn to rest and enjoy their new found fame but a note gets slipped to them from Khelben "Blackstaff" Arunsun (Archmage of Waterdeep) who says that he sent a scout (Amber, a female elven thief/mage of neutral good alignment) to investigate reports of evil brewing in a temple known as Darkmoon but she has not returned. Khelben then transports the heroes to the temple to find Amber and continue the investigation, but it soon becomes apparent that not everything is as it seems....

The gameplay remains within the confines of the temple but players have to explore the vast catacombs beneath, the upper levels of the temple, and the three towers...azure, silver and finally crimson where they can fight the evil Dran Draggore."

Source: Wikipedia, "Eye_of_the_Beholder_(video_game)," available under the CC-BY-SA License.