Urth has a rather high difficulty, especially in the puzzles available in story mode. These require both planning and reflexes, and may seem impossible. What works on paper doesn’t necessarily work so well in the field, and I’ve learned that by repeatedly failing to finish my own levels. Of course some tweaking there and there helped, and feedback from the community helped identify the particularly tough levels which needed ironing out.
Without further delay I present one set of possible solutions to the puzzles:
I don’t doubt that most players devised their own solutions, and if anybody would like to share theirs I’d love to see them.