Several sites specialize in archiving old browser games. Be cautious with ads, but these are generally safe:
Disclaimer: This article is for informational purposes. Bypassing institutional network policies may violate your user agreement. Play responsibly and only on your own devices or network with permission. Unblocked Games Angry Birds
: Use HTML5 or legacy Flash emulators to play directly in a web browser without downloads. Several sites specialize in archiving old browser games