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Petersen's Abominations, now out in PDF, is Chaosium's newest collection of Call of Cthulhu adventures. Hatched from the twisted imagination of Call of Cthulhu creator Sandy Petersen, they began life as scenarios he's ran at conventions - "when I run a game at a convention, it is always e … read more

Gathered from across the aeons, Petersen's Abominations brings together is a collection of modern day scenarios from the twisted imagination of the creator of the Call of Cthulhu RPG himself, Sandy Petersen. Ably assisted by Mike Mason, Call of Cthulhu line editor, each one-shot scenario i … read more

S. Petersen's Field Guide to Lovecraftian Horrors, aka The Petersen Guide, was the first collaboration between Chaosium and Editions Sans Détour, the French licensee for Call of Cthulhu. Christian Grussi and his talented team of artists - Loïc Muzy, Mariusz Gandzel, and Claire Delépée … read more

A note of thanks from Chaosium...It's over - Sandy Petersen's The Gods War attracted nearly 2000 backers, and raised over $585K - wow! Sandy has his note of thanks from Petersen Games to everyone who supported the campaign in this Kickstarter update link.And we at Chaosium also wish to tha … read more

Chaosium is pleased to be participating in Free RPG Day this year! This is the special day where Friendly Local Game Stores all over the world have the opportunity to offer their customers free product donated to them by game publishers.To help celebrate this special day's 10th anniversary (Sat … read more

While we wanted the Kickstarter backers to hear this directly from us first, we also wanted all of you, the faithful, to get this information as soon as possible. Here is what we sent out. More very soon.We have pressed the reset button.In 1975 Chaosium started out as a quirky boutique game company. … read more