Educational and fun websites
Mensa For Kids:
http://www.mensaforkids.org/play/games/
A link for 40xEscape:
http://www.mathplayground.com/logicgames/logic_40x_escape.swf
Play Mastermind:
http://www.web-games-online.com/mastermind/
Math Playground:
http://www.mathplayground.com/
Logic Puzzles:
Million Dollar $ Mission:
http://math.rice.edu/~lanius/pro/rich.html
Math Webquest:
https://sites.google.com/site/theartisticgeek/3rd-grade-math-webquest---measure-that-job
Smithsonian for Kids:
http://www.smithsonianeducation.org/students/index.html
Pentominoes:
https://www.scholastic.com/blueballiett/games/pentominoes_game.htm
Chasing Vermeer:
http://www.scholastic.com/blueballiett/games/index.htm