Chaosium is pleased to announce the release of the Basic Roleplaying System Reference Document (SRD).

The Basic Roleplaying SRD is based on Basic Roleplaying, the simple, fast, and elegant skill-based percentile system that is the core of most Chaosium roleplaying games, including Call of Cthulhu, RuneQuest, SuperWorld, and others.

Under the provisions of the Basic Roleplaying Open Game License (OGL), designers can create their own roleplaying games using the Basic Roleplaying rules engine, royalty-free and without further permission from Chaosium Inc.

For further details and to download the SRD document, see our Basic Roleplaying SRD information page and the dedicated BRP website.

Please note: the BRP Open Game License for use of the Basic Roleplaying system differs from the Wizards Open Game License and has different terms and conditions.