Below is a list of flash game websites, they are less common in order to increase the chances of them being unblocked in strict networks.
http://www.devppl.com/flash-games/
http://www.engineering.com/GamesPuzzles/tabid/82/Default.aspx
http://www.surpassarcade.com/ (careful with this link, recently comments from loyal visitors say the ads are know to be exploits on this game site, we will do some more investigating.