Howdy,
One of the best classes I took in college was Programming Languages where the prof would introduce a language or language concept, do a little playing with it in real time, and send us home with like 10 small little functions or programs to write that used what we learned in class and stretched it just enough to make sure you really understood what was going on. I found that this style of learning was really enjoyable and engaging for me personally.
What I'm looking for is a resource, ideally one that's online, that is in the same vein. Introduce basic operators -> make me use them. Introduce functions -> make me use them. Introduce recursion -> make me use it. Ideally there are ~3 or so questions with answers not in plain view on the site so I won't cheat :)
While resources like this are good, they're not really what I'm looking for. Thanks for any resources!