Temple of Elemental Evil is a turn-based role-playing game using the AD&D Greyhawk campaign setting with 3.5 version D&D rules. The game plot revolves around the (suspected) rise of evil, originating from the Temple of Elemental Evil.
In this game, players start with five generated (or pre-generated) party members in the start of the adventure (a maximum of eight, the later three comprising non-player characters). Unlike most AD&D games, the maximum level cap for characters in this game is the 10th level.
The party itself has an alignment (in addition to individual character alignments) which greatly affects the plot and choices the party makes throughout the game. Character alignments and the party alignment are now closely related. For example, a Lawful Good or Chaotic Evil character may not be selected within a True Neutral party alignment. Additionally, Paladins do not want to be in the same group with anyone evil.
Thus, depending on the party alignment (nine default alignments to choose from), players may either take the course of being the good heroes ridding evil from the land or be the evil raiders butchering anything that moves, all of which (may it be good, bad or neutral), may effect the party reputation.