Simple games, played right here on this page. Nothing to install, nothing to download, no pop-ups, and you never leave my site.
The games I built run on this same page — no sign-ups, no ads, nothing sent anywhere. The two open-source classics were rebuilt here on our own server under their MIT licences, with credit kept and outbound links removed, so they can never phone home or pull you off-site. The freeware classics at the bottom load from their own servers; if one fails, that server is down or it blocked the frame, so pick another. Some need a click inside the frame before the game wakes up.