The Lost Worlds books are combat gamebooks, as opposed to story gamebooks. The different pages of each booklet show the character performing combat maneuvers. Two players each trade booklets, and simultaneously call out maneuver numbers, which are then cross-referenced to determine which page each player turns to, and whether each character's attack succeeds.
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- Lost Worlds Flying Buffalo publishes under license several of this series, including books based on the Knights of the Dinner Table (KODT).
- Yahoo! Groups: Lost Worlds Combat Book Game A fan club, forum and chat.
- Lost Worlds Home Page An image gallery of covers from different series of books using this combat system.
- Lost Worlds Roleplaying Game Center Features rules extensions to help players, including new character previews.