how do i block certain sites.google.com sites without blocking the entire subdomain?

sites.google.com hosts many types of legitimate content but unfortunately there are also many games being hosted and i only intend to block games and these are just a couple of specific urls. there are a lot more if you simply search them.

examples:

https://sites.google.com/view/iogames/home

https://sites.google.com/view/iogames/agar-io-minigame

https://sites.google.com/site/unblockedgame76/stabfish-io
https://sites.google.com/view/game-hub-unbl0cked
https://sites.google.com/view/iogames/stabfish-io
https://sites.google.com/view/pulseunblocked/home
https://sites.google.com/view/unblocked-games-6821/home
https://sites.google.com/view/unblockedgame

currently i can't simply create a block rule to block sites.google.com because it shall result in blocking everything including non-gaming urls. there has to be another way to block gaming urls being hosted in the sites.google.com. this subdomain is notorious for hosting games that elude domain and ip blocking.

my children have informed me that school kids talked about how to bypass firewall filters by visiting these sites.google.com. is there a firewalla solution to block these games. tia

how do i block certain sites.google.com sites without blocking the entire subdomain?

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