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Here's a list of games you can probably get away with at school OR work. They're all .swf games, so you'll need to grab the player. But I got a link for that too and most security won't stop it from downloading.
This has the player and files (3 total) you'll need to play. I'm using Chrome and it downloaded right away without any questions.
https://totalgamer.org/games/SwFPlayers/
Here's the link to get to all the games. (if you didn't hit 'parent directory' on that last link)
https://totalgamer.org/games/
I've downloaded almost all of them, and 95% of them work flawlessly. Beware though there are some there in the "not4work" page that you shouldn't download if your under 18.