Integer Games

http://www.math-play.com/math-racing-adding-integers-game/math-racing-adding-integers-game.html

http://www.sheppardsoftware.com/mathgames/integers/FS_Integer_addition.htm

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

http://www.sheppardsoftware.com/mathgames/Numberballs_absolute_value/numberballsAS2_abs.htm