The games on this site are build in HTML5, which means they can be played in the browser. There are various reasons why they might not work tho, check here for a list you can try:
• Try a different browser
• Make sure you’re playing on a supported browser/OS (see below)
Sometimes, it may just be a problem with your internet connection. Reloading or waiting a minute will resolve the issue then.
These HTML5 games are supported on these platforms & browsers:
• Windows 7 or higher
• Google Chrome
• Mozilla Firefox
• Microsoft Edge (preferably the Chromium release)
Other browsers not on this list may also work just fine, but it is confirmed to work on these.
Note that Internet Explorer is not supported, due it not supporting the technologies that the games make use of.
Levels you make are automatically saved by the games. They are stored in the browser’s Local Storage. Note however that if you clean up space in your browser (e.g. deleting website data), it will also get rid of your levels. Sometimes virus scanners or cleanup software may do this without notice. This is why you should always have a local backup on your computer as well!