Cthulhu: The Great Old One is a simple, free print-and-play card game.
Horror
BioSyndrome Zombie Survival Horror Game
BioSyndrome is a community created game of zombie survival horror.
Zombie Enclave Solo Board Game
Zombie Enclave is a free print-and-play solo boardgame of the Zombie apocalypse.
Fun Paper Monsters
For Halloween, try making some fun paper monsters.
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Hysterical.