The series features Massmouth, a green, one-eyed alien in the employ of an intergalactic magnate, The Worm, who loves collecting unique and valuable artifacts. Massmouth is one of the men tasked with retrieving stuff for The Worm from a variety of planets, and such quests are what the original The Adventures of MassMouth consists of.
MassMouth 2, boasting a more complex storyline, sees The Worm's base attacked by mysterious invaders and The Worm kidnapped, prompting Massmouth to head out to rescue his boss. Massmouthmas is a "Christmas special" puzzle level.
The mods are designed for the game port ZDoom. (Unfortunately, the latest versions of ZDoom appear to have some compatibility problems which may make certain parts unpassable without cheats.)
Tropes featured in the entire series:
- CamelCase: Variable—the author sometimes spells the protagonist's name as "MassMouth", and sometimes simply as "Massmouth".
- Cyclops: Massmouth. He also appears as a bot in Skulltag (a Doom source port focused on multiplayer) where one of his lines is a complaint about his lack of peripheral vision.
- The Worm (whose appearance is taken from Half-Life: Opposing Force's Pit Worm.)
- Idiot Hero: Massmouth doesn't seem to be very bright. Especially visible in Massmouth 2, where his lines are basically mostly "what?" or "uh?"
- Nintendo Hard: MassMouth 2, as well as the later parts of The Adventures of MassMouth. Oooh boy. The enemies aren't numerous, but they have a lot of health, hit really hard, all while ammo is very scarce.
- Reference Overdosed: There are a lot of direct quotes and shout-outs (for example, the Worm's employees have names like Freeman and Spock). Furthermore, many of the enemies and characters include real-life persons or are taken straight out of other games, such as Half-Life, though they're given different names.
- Species Surname: The Worm, though it might be just a nickname.
Tropes in The Adventures of Massmouth:
- Abandoned Mine: Found on the planet Nero, and populated with dangerous Stuka-Bats (which are the very reason the mines were abandoned).
- Artifact Collection Agency: The Worm essentially has his own Artifact Collection Agency meant to fill out his, well, private collection of artifacts.
- Bat Out of Hell: The Stuka-Bats, which inhabit the dark mines of Nero.
- Collector of the Strange: The Worm.
- The Full Name Adventures
- Infinite Flashlight: The Zippo Lighter, used to light up the dark areas in the mine level. It's actually a replacement for the chainsaw, that makes clever use of Doom's built-in Muzzle Flashlight code.
- Lost Superweapon: The "Eye of Mahan", created by a wizard for an ancient king, supposed to "take out entire legions of men". Subverted—for all its fame, it simply doesn't work at all, and probably never did.
Tropes in Massmouth 2:
- Big Bad: John Romero.
- Evil All Along: The Qbot, who initially offers to guide Massmouth to a getaway vehicle, but attempts to lead him to his death multiple times, as he's secretly working for the Big Bad.
- Got the Whole World in My Hand: One of the ending splash screens, for the ending where you kill both the Worm and Romero and take over their empires, shows Massmouth grabbing the entire galaxy.
- I Always Wanted to Say That: Trooper, after he quotes Lord of the Rings: "I come back to you now at the turn of the tide."
- Missing Mission Control: Trooper getting killed by the Big Bad. He comes back as a Spirit Advisor, though.
- Multiple Endings: Six of them. In the text file for Massmouthmas, the author tartly notes that making a sequel would be a real pain now.
- Outside-Context Problem: A side-plot involves "Rattamahattas", a belligerent race that wishes to take over the hero's home planet.
- A Planet Named Zok: Zeeble, Massmouth's home planet.
- Punny Name: Professor Egnogin.
- Spirit Advisor: Trooper. He even refers to it as "a Star Wars thing".
- Uncanny Valley: In one of the endings, Massmouth notes that the way the Big Bad's head always seems to be facing him is really creepy.
- Unexplained Recovery: Linguica.MassMouth: Doesn't anybody stay dead any more?
- Video Game Tutorial: For some inexplicable reason, MassMouth 2 has an optional tutorial which basically teaches you how to play a first-person shooter.
- We Can Rule Together: The Big Bad attempts this on Massmouth, twice. The first time, your choice determines the next mission only, since if you agree to work for him then he decides you're too dangerous to keep alive anyway. He tries it again at the end of the game; cue Multiple Endings.
- Widget Series: This game is kind of bizarre at times (the village of miniature John Carmacks, anyone?).