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Re:Untrusted – a user JavaScript adventure game by michaelkeenan on Sunday March 24, 2019 @01:56PM (#19477679)
I like this one, made by Google - it teaches XSS vulnerabilities: https://xss-game.appspot.com/

It's been discussed on HN twice:

https://news.ycombinator.com/item?id=13021869

https://news.ycombinator.com/item?id=7815237

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