NeverQuest/References

Cultural references

The name NeverQuest is a reference to the online MMORPG game EverQuest, and possibly the game Neverwinter Nights.
When Homer gets the keycard he says "My precious", which references Smeagol/Gollum from Lord of the Rings.
Homer's outfit is a reference to the character Link from The Legend of Zelda.
Marge's outfit is a reference to Princess Zelda from The Legend of Zelda.
The chests which contain different items are references to MMORPGs, along with fantasy games such as The Legend of Zelda.
Homer refers to Marge as being "a sexy MILF", which Marge corrects by saying that the word is "elf".
The Mobbits are parodies of the Hobbits from The Lord of the Rings.
One of the Mobbits sometimes says that he prefers Narnia, the fictional land of the C.S. Lewis The Chronicles Of Narnia book series. It's either the Rod or Todd Flanders Mobbit that says this, since C.S. Lewis is a Christian book author.
Some of the characters and their costumes are from Earthland Realms, an online game in the Simpsons universe which parodies online MMORPGs.
Upon entering the maze area, Marge notices the camera switching to overhead POV (point-of-view). Homer states that this is just like his favorite old sword-and-sorcery game, Dig Dug - which is neither a sword-and-sorcery game nor even set in overhead POV, at least not until the sequel, Dig Dug II.

He possibly meant The Tower of Druaga, a fantasy adventure game also made by Namco, or more likely Gauntlet by Atari Games, due to the similarity of how its "narrator" points out things like not shooting the food. And due to the similar looks of enemies, that is probably the case.

Sometimes, in the final part of the level where Homer, Marge, and the Mobbits confront the Dragon, Marge asks "Which one of you is gay again?"