http://www.gog.com/en/gamecard/the_temple_of_elemental_evil
The Temple of Elemental Evil is a role-playing game based upon the famous Greyhawk adventure and created by now-defunct Troika Games. The story revolves around the rise of evil in the once peaceful and prosper city of Hommlet. The sudden appearance of evil forces seems to be originating from the once defeated and sealed Temple of Elemental Evil. The history likes to repeat and it's up to you and your party to not allow it happen again.
The game allows you to create a party, of up to 5 adventurers and up to three NPCs, and chose the party's alignment which will affect the plot and choices it makes throughout the game. The developers used a turn-based combat system which was acknowledged by many gamers as the most faithful representation of the pen-and-paper D&D 3.5 rules in a computer game. If you're a true D&D fan you can't miss this creation from true D&D fans