There are several ways to unblock games for school;
Use a VPN: A Virtual Private Network (VPN) can encrypt your internet traffic and make it appear as if you are accessing the internet from a different location. This can sometimes allow you to bypass filters and access blocked games.
Use a proxy server: A proxy server acts as an intermediary between your computer and the internet, allowing you to access blocked websites by routing your traffic through a different server.
Use a web-based proxy: There are many web-based proxy services available that allow you to access blocked websites, including games, through a web browser.