Tunnels & Trolls is a fantasy role-playing game designed by Ken St. Andre and first published in 1975 by Flying Buffalo. The second modern role-playing game published, it was written by Ken St. Andre to be a more accessible alternative to Dungeons and Dragons and is suitable for solitaire, group, and play-by-mail gameplay.

These are all in pdf format.

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Included Books:
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Tunnels & Trolls 5th Edition
Tunnels & Trolls 6th Edition
Tunnels & Trolls 7th Edition
Abyss
Beyond the Silvered Pane
Blue Frog Tavern
Buffalo Castle
Crusaders of Khazan
Dargon's Dungeon
Deathtrap Equalizer Dungeon (1st Edition)
Deathtrap Equilizer Dungeon
Gamesmen of Kasar
Goblin Lake
Labyrinth
Misty Wood
Monsters & Magic Book
Monsters Monsters
Naked Doom (2nd Edition)
Naked Doom
Overkill
Rat on a Stick
Sea of Mystery
Sewers of Oblivion
The City of Terrors
The Dungeon of the Bear
Weirdworld