I complain loudly and often about the amount of time that is wasted playing video games.
I’ve found some that I like and thought that I should pass along the link. They present interesting problems that are fun to solve and build upon each other.
They are not (in my humble opinion) a waste of time.
http://www.sciencemuseum.org.uk/onlinestuff/games.aspx
The Science Museum website has lots of fun and interesting stuff and the Museum itself is wonderful, if you should find yourself in London.
Thanks to one of my favorite blogs ( Tales From a 21st Century Teacher ) for this resource.
Mr. Fulton