Take a blocked game URL and run it through Bitly or TinyURL. The filter sees the shortener (allowed) rather than the game host (blocked).

Many students create "unblocked" sites using Google Sites (which schools rarely block because it’s a Google product). Search your school’s domain for site:google.com "100x unblocked" .

Old Flash games are archived on Archive.org. Schools rarely block this educational archive. Play retro classics legally.