How do you play the games and on what browser?
If you use Chrome and you play them on your hard disk, first open any HTML game, then press F12 to open DevTools, go to the Application tab, expand Local/Session/Shared Storage and Cookies, right click on file:///
and click Clear.
Additionally, visit the page: chrome://settings/content/all
Sort the domains by name, go to file:///
and click on the trash bin icon.
Note that this does not clean data of games played either online or through a local we bserver (domain 127.0.0.1
).