This being an adaptation of the original module, the backstory of the plot veers a bit into Alternate Continuity: Troika used the description used in the original module and added the future Circle of Eight to the Battle, even going as far as having them be the only reason the Battle was won, rather than using the official post-Gygax version of events where the then-named Citadel of Eight never even participated in the Battle. Other than that, very little has changed with the overall plot when compared to the module.
Although buggy upon release (even by Troika's usual standards), the game received some praise, mainly for its relatively faithful adaption of the Dungeons & Dragons 3.5e combat rules, and has since developed a strong cult following, with fanmade patches fixing the most problematic bugs. The game is currently available on GOG right here. There is also a total conversion mod for the game, turning it into an adaptation of the Keep on the Borderlands module.
Tropes exclusive to Troika's adaptation include:
- Absurdly Low Level Cap: The original game has the level cap at 10, half that of the tabletop game. One of the changes made with the Circle of Eight mod is the option to increase the cap up to 20. Appropriately for the unmodded game, all the spell casting classes are limited to spell levels 1-2 for rangers and paladins, levels 0-4 for bards, and levels 0-5 for clerics, druids, sorcerers, and wizards. To balance this out, however, a number of spells were not even put in and some of the higher level spells were "downgraded" to replace them.
- Adaptational Badass: Zuggtmoy's original appearance was that of a comical puffball mushroom. She's now much more fearsome and intimidating, appearing as a blue-skinned demonic female with long sharp claws and whose lower body consists of strands of fungoid matter. Wizards was apparently so impressed with the new appearance that it was made her canon true form for 3.x Edition, with the original appearance being a mere aspect.
- A Load of Bull: There's only one minotaur in the game, which is found guarding a chest.
- Arbitrary Headcount Limit: You can only have up to 5 PCs and only have a maximum of 3 NPCs with you at any one time. The Circle of Eight mod allows you to replace the NPC slots with PC slots, allowing a party of up to eight PCs, but you cannot go beyond this limit.
- Artifact of Doom: Apart from being able to cast several spells, the Orb of Golden Death is wanted by both Iuz and Zuggtmoy, who are able to coerce whomever holds the skull.
- Bi the Way: Depending on where you first speak to him, Bertram will either be interested in a male or female player character.
- The Blacksmith: There's a blacksmith in Hommlet who works during the day, and there's Otis in Nulb who is actually investigating a temple. He's also a recruitable NPC. Both of them sell masterwork items.
- Bring My Brown Pants: When Zuggtmoy finally reveals herself to you, and threatens to kill you slowly and painfully, your responses are:1. [attack]
2. [try to flee]
3. [soil yourself]
- Card Sharp: Recruitable thief Furnok, is initially seen at an inn where he challenges people to either dice or cards. The bartender suspects that he's actually cheating, but a party member with a high spot skill is required to catch him in the act.
- Character Alignment: The game uses the standard D&D alignment system of nine alignments. In addition, it also requires a party alignment, where party characters are within one step of the designated party alignment. The immediate effect determines the starting quest for the party, and it later affects some dialog options.
- Dialogue Tree: Most conversations have several options for dialogue including special options for characters with high enough levels in skills such as bluff, intimidate and diplomacy.
- Did You Just Punch Out Cthulhu?: You can "kill" Iuz, which affects the ending.
- Early Game Hell: Level 1 D&D characters tend to be very weak, thus this trope shouldn't be a surprise. To help, you can recruit at least one NPC (e.g. the drunkard Elmo) to make some of the encounters easier. On the other hand, at least one of the starting quests is extremely dangerous for a starting party (e.g. the Neutral Evil party need to kill Terjon, who is a higher level cleric.)
- Fortune Teller: Mona is a gypsy fortune teller in Nulb who tasks the players to find her stolen orb.
- Game-Breaking Bug: Having a Chaotic Good character use Fragarach and/or Scather in the Fire Node or the Fire Temple causes the "Chaotic Good wielder has unlimited Attacks of Opportunity" effect of the weapon(s) to infinitely loop and lock up the game. Unfortunately, the effect is hard coded into the game, meaning that even the CoE mod team couldn't fix it. The only way to avoid it is to either not use the blade(s) at all or let someone who is Chaotic Neutral or Neutral Good wield them instead.
- Game Mod: The game still has a fairly active modding community, working hard to fix the Obvious Beta state and add other content and improvements. Most notable is the Circle of Eight modpack, a large series of bugfixes, addons, and a whole new area to explore after finishing the main game, and the new Temple+, which is addressing problems hardcoded into the engine itself.
- Gay Option: You have the option of developing a relationship with Bertram.
- Gentleman Thief: Furnok is well spoken, good mannered and sharply dressed.
- Hopeless Boss Fight: While not impossible, Iuz is extremely difficult for most parties to even think about beating since he has high DR against non-holy weapons and non-ice energy damage. But if you play well and use Scather, the elemental power gems (to summon high level demons) and magic missile your main obstacle is the time limit.
- Hell, you can even try to take on Saint Cuthbert himself, although it's suicide (forty attacks a round in melee will obliterate any character). However it is possible to kill him by using a specific spell and exploiting the poor AI. Have one character use a missile weapon on him from a distance. Saint Cuthbert will charge the character and attack once (moving and attacking only allows one attack rather than the full attack allowance.) Have your caster cast Otiluke's Resilient Sphere on the character who shot him. This prevents the character from attacking but also prevents all damage to them. Saint Cuthbert will now futilely wail away on the sphere while your other characters pelt him to death with spells and missiles.
- Joke Character: Ted, Ed and Ed, neither of whom can be recruited without recruiting the other two. Ted speaks like a hillbilly, while the Eds don't speak at all. They're only available if, when asked what you seek in your future by a fortune teller after completing a quest, you respond with the "humor in all things" option.
- Modular Epilogue: What ending "slides" you see depend on your actions, such as rescuing Prince Thrommel.
- Multiple Endings: Several actions that you take throughout the game can affect the ending.
- Obvious Beta: As per Troika's usual standards there are many bugs in the game. Subsequent patches, both official and unofficial, have fixed the worst problems. But certain bugs are still present, which is why the people behind the Circle of Eight mod have given a list of general guidelines to follow in order to not encounter any serious bugs.
- Red Light District: Nulb originally included a brothel, complete with sidequests. It was cut, either on WotC's order or due to time constraints, but the Circle of Eight mod restored it.
- Roboteching: The Magic Missile spell is always animated at different curved angles before it reaches it's target.
- Romance Sidequest: There are a few romance options in the game, including several NPCs who won't join your party. Of the joinable members there are 3 who can be romanced and your character may even get married to them. There are more options for male characters.
- Save Scumming: Doing the same thing keeps the results the same, but doing it slightly differently (say, attacking from the left instead of the right) will get a new result.
- The game has an iron man option to inhibit the save/load abuse.
- Summon Magic: Apart from the standard D&D spells, which allow you to summon a monster, undead, or animal according to the spell, several monsters also use summons, such as demons. Zuggtmoy can summon several species of fungus based monsters. The Orb of Golden Death allows you to summon 4 kinds of elementals and 4 kinds of demons depending on which gems are stored in the skull.
- Temple of Doom: The titular temple, which is filled with all sorts of monsters, cultists, and an evil goddess.
- Time Limit: If you do decide to fight Iuz, you have only a short time to do so before he teleports away.
- Title Confusion: The subtitle "A classic Greyhawk Adventure" appears on the cover/disc, the first patch's installer and copyright screen, but is absent on the installer, title screen and the 2nd patch's installer. Interestingly the "the" at the start of the title (see up) is always present.
- Token Evil Teammate: Several can be recruited in-game, including a hill giant, a troll and an alu-fiend. Some of them will turn on your party if the opportunity presents itself. Having monsters in your party will mean that some NPCs, such as shopkeepers, will refuse to talk to your party.
- Wedlock Block: Melanie's father will only let her get married to the player character if her older sister marries first, and if he thinks the character is sincere enough.
- Wretched Hive: Nulb is full of pirates and other shady types, including people linked with the titular temple.