A very addictive puzzle that is great for building logical thinking whilst reinforcing basic maths skills. Three thumbs up!

http://kenken.com/play_console.html

A really cool logic game! Three thumbs up!

http://www.coolmath-games.com/0-bloxorz/index.html

In this cool game, you have to move a point to construct a given figure, eg a parallelogram, or an angle bisector. Your distance from the correct point is recorded. At the end your average error is given. There is a Top Ten Scoreboard as well as a Top Score for your computer. Three thumbs up!
http://woodgears.ca/eyeball/index.html