Addition and Subtraction Equations Games

http://www.kidsmathtv.com/learn/pre-algebra-subtraction-2-game-for-7th-grade-monster-board-game/

http://www.math-play.com/One-Step-Equation-Game.html

http://www.math-play.com/soccer-math-one-step-equations-game/one-step-equations-game.html

http://www.xpmath.com/forums/arcade.php?do=play&gameid=69 (click "start")

http://www.xpmath.com/forums/arcade.php?do=play&gameid=68 (click "start")

http://www.mathplayground.com/algebraequations.html