The Perl Weekly Challenge is a great source of practice problems
The Perl Weekly Challenge is a great source of practice problems

theweeklychallenge.org
The Weekly Challenge - Perl & Raku

I'm adding it to the sidebar under practice.
I was alerted to it via this nice blog post with a solution in Factor.
I'll put up at least a few Factor solutions of my own at a tiny repo, and am happy to answer any questions or take any advice about them.
Here's another link to the challenges