Be careful with sites asking you to download "unblocked" .exe files or browser extensions, as these are often malware. Stick to sites that run the game directly in the tab.

isn't blocked, you can stream the full Steam version directly through Chrome or Edge.

If the GeForce NOW site itself is blocked, you may need a web proxy or VPN to access it. Official Game Links

If you are looking for legitimate ways to play or learn about the game, these official and community resources are the most reliable: Download TF2 for free on Steam.