Dots and Boxes - Dots and Hexagons - http://www.drking.plus.com/hexagons/dots/ Describes the rules for playing on a squared grid and introduces a variation of the game.
Mathematical Games: Sprouts - http://www.madras.fife.sch.uk/maths/games/sprouts.html Brief summary of the game with diagrams.
Pencil and Paper Games - http://www.geocities.com/paper_games/ Instructions for playing Tic-Tac-Toe, Squares, Sprouts and Othello.
Pencil and Paper Games - http://orion.math.iastate.edu/danwell/MathNight/ppg.html Animated instructions showing how to play Sprouts, Pipelayer and Capture.