Unblocked Game Websites
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coolmath-games.com
A variety of games, part of the site is in fact blocked, so stick on the listed one.
google.com/site/unblockedgames77/
A variety of games, some abridged, but a few do not work. Probably the best choice if you don't know what you want to do.
boredbutton.com
Each click sends you to different mini-sites with new things to do. Approximately half the sites are individually blocked, but they are all fun.
xtremetron.com
Tron, plain and simple.