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Mammoth Island is a game design duo consisting of brothers Mathew Iantorno and Michael Iantorno. We design adventures, rules, and resources for tabletop roleplaying games.
Thumbledore's Tiny Dungeons #1
Finesse and Might
Thumbledore's Tiny Dungeons #10
Visit the Weird Decaying City of Moth Hovel
Darling Amongst the Dust
Untamed and Unbound
Little Bones
The Leech- Tendencies: Spirits and Glamour Playbook
Inhuman Resources: Team-Building Activities for Humans
Thumbledore's Tiny Dungeons #12
Wizardry and Bureaucracy
Thumbledore's Tiny Dungeons #3
Gear, Overhauled
The Last Voyage of the Shadow
Visit the Wild Decaying Island of Bermoothes
The Undercroft of Saint Amis
Ouroboros - WIP
The Honed- Tendencies: Spirits and Glamour Playbook
Thumbledore's Tiny Dungeons #8
Thumbledore's Tiny Dungeons #2
GREMLINS
FIST: Hecatoncheires
This Crypt Will Be Your Tomb
The Acolyte
Thumbledore's Tiny Dungeons #5
Oh No
Guests for Yazeba’s B&B
Kith and Kin
One Page Dungeon Anthology
Thumbledore's Tiny Dungeons #9
Mammoth Island Adventure Club
Stakes and Silver
The Wanderer's Guide to the Wilds
The Hidden Shrine of  the Salmon-Men
Somebody taught the axolotl how to talk
Thumbledore's Tiny Dungeons #7
Thumbledore's Tiny Dungeons #11
For the Hoard
Phylactery
Non-Fungible Tentacles
Thumbledore's Tiny Dungeons #4
Thumbledore's Tiny Dungeons #6
Legerdemain
rodent: original sin
If you like Children of the Court check out...
We LickToad Goblins: A  Goblin CC Adventure   - We LickToad Goblins
Alone on a Map   - A solo ttrpg map making game
The Treasure At The End Of This Dungeon Is An Escape From This Dungeon And We Will Never Escape From This Dungeon   - A kaleidoscopic roguelike dungeon crawl
Goblinville - Rules of Play   - Issue One of the Goblinville Gazette
You are 100 Goblins, Now Go Save the World   - A one page TTRPG where you take control of 100 Goblins as you try to save the world!
KILLOTINE   - Cyberpunk Roguelike TTRPG
The Dark Sentencer   - a game about escaping space prison.
Knowing You   - A Two Player Prompt Based RPG exploring a romantic relationship broken beyond repair.
Fable on your Table   - Tabletop Papercraft Miniatures Roguelike
Maximum Apocalypse   - A cooperative roguelike tabletop adventure game for 1-6 players
The Goblin Warrens   - A micro-RPG about a band of goblins
52 Fates   - A dangerous, unique fantasy RPG that uses a regular 52-card deck for its mechanics!
If you like Sword Saga check out...
PARTY ANIMALS   - A game about animals
Village Witch   - A solo journaling game about a witch finding a home.
Cursed Lands   - A short RPG about adventures and curses
Dead Letter Office   - Deliver letters from the dead to the living. Bear witness.
Jonathan Frakes Wants Your Attention, And You Must Not Give It To Him   - A game of being haunted by a vengeful spirit, in the form of the actor from Star Trek.
Beyond the Pages   - Where will you go and what stories will you tell?​
Rivals   - A two player game  about competitive story telling
Tarot Telling For Two   - A Tarot-based RPG for Two Players
Temple of 1000 Swords   - A tarot inspired TTRPG dungeon-delve for Old-School Essentials.
Telling the Bees   - A storytelling game about the year in the life of a small, farming community, as told to the town's bees.
First Dig 2 Graves   - The storytelling game of deadly rivalry for two players.
GUN&SLINGER   - a 2-3 player game about a sentient weapon and their wielder
Grinderbin's Mobile Market of Ridiculous Magic Items   - 120+ quirky, magical, low-powered items for tabletop RPGs to encourage creativing thinking without breaking the game
Sapling Soul   - A solo ttrpg where you explore a Forest and help heal it. Inspired by We Forest Three by Rae Nedjadi.
the girlfriend of my girlfriend is my friend!!   - a simple ttrpg about the magical disaster of trans young adulthood
Sentinel   - A solo journaling game about a place of great power and its lone guardian.
Session Zero   - A deck based character creation game.
DELVE: A Solo Map Drawing Game   - A Game Of Digging Too Deep
KENZIE'S PROJECT   - a 3-player horror game about how academia changes us
A Simple Life - Roll & Write Game   - A roll and write game inspired by Stardew Valley. Roll your dice and complete your goals!
UMBRA: A Solo Game of Final Frontiers   - Discover and draw your own space colony in this lightweight zine.
Session Zero: World Building Edition   - A deck based world building game
Session Zero: Bond Building Edition   - A deck based game about establishing bonds between characters
Cozy Town   - A Sweet Community Building Game