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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 #3
One Page Dungeon Anthology
Thumbledore's Tiny Dungeons #12
This Crypt Will Be Your Tomb
Mammoth Island Adventure Club
Inhuman Resources: Team-Building Activities for Humans
Thumbledore's Tiny Dungeons #7
Thumbledore's Tiny Dungeons #11
Thumbledore's Tiny Dungeons #4
Thumbledore's Tiny Dungeons #5
Thumbledore's Tiny Dungeons #1
Little Bones
Non-Fungible Tentacles
Thumbledore's Tiny Dungeons #10
The Acolyte
Oh No
Phylactery
Thumbledore's Tiny Dungeons #6
Thumbledore's Tiny Dungeons #9
Thumbledore's Tiny Dungeons #2
Thumbledore's Tiny Dungeons #8
If you like RUN ME check out...
Session Zero   - A deck based character creation game.
Session Zero: World Building Edition   - A deck based world building game
6e   - This is what it looks like.
Spindlewheel Microgames   - Tarot-like card games for 1-5 players
Dice Souls   - Souls-like Dungeon Exploration
Spindlewheel   - a tarot-like storytelling game.
Beyond the Rift   - A metroidvania-like tabletop game set in a world without memory.
WE STARVED HEARTS   - a card-based collaborative storytelling game for three or more
The Immortal Seal   - Souls-like Pamphlet TTRPG
Hesitation at the Gate   - A Tarot based ttrpg
NERVE   - A one page RPG about escaping a house and the ghost that commands it.
The Devil Game   - Would you like to play a game?
If you like The Hidden Isle - Playtest Version check out...
Offworlders   - A lightweight planet-hopping table top role playing game
Divined Journey   - A tarot-guided walk through the Hero's Journey and Virgin's Promise
Ironsworn   - A tabletop RPG of perilous quests for solo, co-op, and guided play
Primal Quest - Essentials   - A Weird Stone & Sorcery Adventure Game
Forget-Me-Not: Myosotis   - Create characters from the memories they left behind.
Dungeon Reavers   - A mini-zine ruleset for tabletop adventures
Tarot Telling For Two   - A Tarot-based RPG for Two Players
Sharp Swords & Sinister Spells - Core Rules   - Streamlines Neo OSR Rules for Pulp Fantasy Sword & Sorcery Adventures
The Land Whispers   - A card game of discovery and improvisational storytelling for 1-4 players
Spindlewheel Microgames   - Tarot-like card games for 1-5 players
Hesitation at the Gate   - A Tarot based ttrpg
UNCONQUERED Free Edition   - A free edition of the UNCONQUERED core ruleset.
The Million Islands of Doom!   - "The Million Islands of Doom" is an adventure zine compatible with any system you can get your hands on.
Anti-Sisyphus: Narrative 1   - Make any game a story game in classic Anti-Sisyphus style
Kingscairn Issue 1   - A Victorian Science Fantasy Zine for Troika!
Sigils in the Dark   - Solo journaling game and GM supplement.
Old Wind #1 an OSR zine (Electric Bastionland)   - An OSR zine with an assortment of extra rules for Electric Bastionland and other OSR games
Raid on the Decadent Spires   - An opulent, Tower-Crawling adventure for the world’s most popular role-playing game
Adventure Conversions for Liminal Horror   - A compilation of adventure conversion guide for Liminal Horror.
Game Unfolding Machine   - Play RPGs without GM
The Last Island of Humans   - A place you can put in your pocket. Rules Agnostic TTRPG Setting.
The Undercroft 11   - The second series of The Undercroft
Odds and Ends Issue 1   - A science fantasy TTRPG zine
One Page Solo Engine   - A minimal, all-in-one toolkit to play your favorite tabletop RPGs without a GM.