If you are looking for a reliable place to start, several community-led projects are frequently updated:

Click the "Fork" button on a repo like cgolden15/Slope-Game to copy it to your own account.

If your specific URL gets flagged, simply changing the name of your repository will often unblock it again. Gameplay Tips for High Scores

Developers often fork the original code to add "hacks," new levels, or gravity-defying mechanics, such as those found in Slope 2 Unblocked . Popular GitHub Repositories for Slope

If a specific link is eventually blocked, you can easily "fork" or clone a repository to host it yourself: