I'm learning Rust and feeling like it would be awesome if there was some sort of game or training drill that somehow gave rust concepts, taught you how to solve them and quizzed you on your answers. I'd do it for as many hours as it took to pound the concepts into the mind.
Does any such thing exist? Unlikely I imagine.
And I know of course that the best training is programming, but something that explicitly aims to teach would help accelerate the learning process.