Algebra (TWO STEP EQUATION GAMES). LETS HAVE FUN :)
http://www.math-play.com/Two-Step-Equations-Game.html
http://www.math-play.com/equation-puzzle/equation-puzzle.html
http://www.xpmath.com/forums/arcade.php?do=play&gameid=64
http://www.shodor.org/interactivate/activities/AlgebraFour/
http://www.quia.com/rr/325253.html
http://www.quia.com/rr/4096.html
https://www.ixl.com/math/grade-7/solve-two-step-equations
http://www.math-play.com/Two-Step-Equations-Game.html
http://www.math-play.com/equation-puzzle/equation-puzzle.html
http://www.xpmath.com/forums/arcade.php?do=play&gameid=64
http://www.shodor.org/interactivate/activities/AlgebraFour/
http://www.quia.com/rr/325253.html
http://www.quia.com/rr/4096.html
https://www.ixl.com/math/grade-7/solve-two-step-equations