M.A.D. video review:
Equation Pong: http://www.xpmath.com/forums/arcade.php?do=play&gameid=105
Algebra Meltdown: https://www.mangahigh.com/en-us/games/algebrameltdown
Equation Balancer: http://www.mathsisfun.com/algebra/add-subtract-balance.html
2 Step Arcade Games: http://www.classtools.net/arcade/201411_iYXBDQ
Please see the videos below to review modeling addition/subtraction with algebra tiles and also modeling/simplifying algebraic expressions.
Adding/subtracting integers with algebra tiles:
Adding/subtracting integers by drawing algebra tiles:
Modeling and simplifying algebraic expressions with algebra tiles or by drawing algebra tiles:
Video reviewing how to calculate the GCF of a algebraic expression and then how to use the distributive property to factor out the GCF.