MATHO

Multiplication math game
http://www.aplusmath.com/games/matho/MultMatho.html

Algebra Planet Blaster

Solve for x in Algebra Planet Blaster.
http://www.aplusmath.com/Games/PlanetBlast/index.html

Absolute Value Ball Drop

Sharpen your math skills with absolute value. Try this ball game
http://www.sheppardsoftware.com/mathgames/Numberballs_absolute_value/numberballsAS2_abs.htm

Add Like Mad

Here is a game that sounds easy, but is tough to master. Try out Add Like Mad
http://www.sheppardsoftware.com/mathgames/Add%20Like%20Mad%20Math/addlikemad.htm

Croc Doc

Think you can divide? See how fast your hand is as you click on the crocodiles.
http://www.sheppardsoftware.com/mathgames/popup/popup_division.htm

Math Man PacMan advanced level

After you have mastered the easier version, become an expert Math Man with this advanced level game.
http://www.sheppardsoftware.com/mathgames/mathman/mathman.htm

Math Man PacMan

Solve equations and eat the ghosts before it's too late in this game similar to PacMan.
http://www.sheppardsoftware.com/mathgames/mathman/mathman_easy.htm

Balloon Pop

Think you're fast? Try and pop balloons in the fraction race.
http://www.sheppardsoftware.com/mathgames/fractions/Balloons_fractions1.htm

All about the hidden cube

Think you have good perspective? Try this cube game.
http://www.mathplayground.com/cube_perspective.html

SpaceBoy

Space Boy to the rescue with coordinate pairs
http://www.mathplayground.com/spaceboyrescue.html

Guide the Gecko

Journey through the land of fractions in Guide the Gecko
http://www.mathplayground.com/FractionGame/GuideGecko.html

TranStar

Use your knowledge of reflections, rotations, and transformations to win
http://www.mangahigh.com/en_us/games/transtar

Pyramid Panic

http://www.mangahigh.com/en_us/games/pyramidpanic

Use your geometry skills to escape from the panic!

Cube net game

Here is the link to challenge yourself to find all of the nets for a cube. (You will need to mouse scroll up about half a page to find the game.)
http://gwydir.demon.co.uk/jo/solid/cube.htm#cubenet