» Monochrom's Massive Multiplayer Thumb-Wrestling    Explains the basics as well as multi-player variations. Includes photographs.    http://www.monochrom.at/daumen/netzwerk-eng.htm

» Samurai Thumbs    Describes how to play this game using helmeted thumb wrestlers as warriors. Includes some variations.    http://www.deepfun.com/thumb.htm

» Thumb Wrestling    Describes how to thumb wrestle, with a snake in the grass variation.    http://www.gameskidsplay.net/games/other_games/thumb_wrestling.htm

» Wikipedia - Thumb Wrestling    Description of how the game is played.    http://en.wikipedia.org/wiki/Thumb_Wrestling