This one is a little gimmicky and doesn’t have the most interesting solution, but I felt that I needed to try making at least one these. I’ve tried to make a more interesting version of this a couple times, but it always ended up being more of the same.
Rules: Draw a connected network of branching lines through the centres of some cells without forming any 4-way intersections or closed loops. Every endpoint is marked with a number, and every number marks an endpoint, indicating the total line length from the endpoint to the nearest branch point.