While I’m writing up some notes on the recent WPC (team gold yay!), here’s a practice puzzle I made, for the skyscrapers round. It’s quite a neat variant, called “first invisible”.
You can solve online (but be warned that the solution isn’t checked correctly).
Rules Fill the grid like a usual skyscrapers puzzle. However, instead of counting visible buildings, clues indicate the first non-visible building from that side.
Or see the instruction booklet.