iApps4free
Content: Usability:
iapps4free.com/ (xhtml-mp)
iapps4free.com/ (xhtml-mp)
A small collection of web based games including sliding block puzzles and tic tac toe. Although based on the site's name the games are targeted at the iPhone, the games I tried also worked on Android and Bada phones and a Nokia N8. I suspect that at least some should work on any device with Javascript support and a touch screen.