Here is a post I saw on Salesforce Developers Forum which I am sure can help you too.
https://developer.salesforce.com/forums/?id=906F00000008rURIAY I am sure that should help you.
If you are not satisfy with the discussion you can start with the new thread
In truth, Slope Unblocked is a difficult game to learn because it takes a long time to master ball control. As I previously stated, the gameplay is unpredictable, providing a thrilling experience each time you play. At the same time, it incorporates characteristics of running and ball control. There are no stages or levels because it has an unlimited running mode.
The link (https://www.paradisosolutions.com/moodle/moodle-salesforce/index.html) does not work