I made some puzzles for the German maths kangaroo prize booklets a while back. Today, they put a set of Slitherlink/Fences/Rundweg puzzles online as part of their offer for kids who are currently staying home due to the virus. You can solve them, too: https://www.mathe-kaenguru.de/zuhause/
That puzzle type switched back to being a shading-first puzzle; I had previously made it an “unshading-first” puzzle for autocheck, but I’ve since changed autocheck for (some / most) shading puzzles to require all cells to be decided before triggering, so the major downside of shading-first is gone.
Here’s a little cave I made to illustrate a downside of my recent change to switch the puzz.link solver back to “shading first” for Cave and Nuri-Misaki.