Aquarium rules apply: each region must be split/coloured into 'air' (green) and 'water' (blue) cells. (Some regions can be entirely one type.) All water cells must be below all air cells, and cells in the same row and region must be coloured the same. Additionally, in each region, the digits in water cells must all be larger than those in air cells.
Numbers around the outside indicate both the number of water cells in that row/column, and the number of skyscrapers you can see from that edge, if larger numbers are taller skyscrapers, blocking the view of smaller skyscrapers behind
Solution code: Enter the 3rd, then 7th rows, from left to right, with no spaces.
on 17. September 2021, 14:15 by Krokant
Great combination of variants. That was sooo much fun.
on 17. September 2021, 09:01 by dissonance
Very interesting rulesets, well done.
Thanks for sharing.
on 2. July 2020, 10:03 by MartinR
Really nice puzzle, I'm a big fan of puzzles that have independent but interrelated constraints.
One minor formatting suggestion; might be worth having the outside numbers in a different colour as the two 2's looked very similar when scanning the grid
on 26. June 2020, 06:28 by Mody
Tolle Konstruktion
on 25. June 2020, 20:18 by mjg123
I really enjoyed this. The interplay between the rulesets with the larger numbers "sinking" into the water was great, and using the same clues for both is incredible! It was tempting in a few places to use uniqueness to make progress but I'm glad I didn't because it was a lot of fun chasing the logic around. Thank you Sam
on 24. June 2020, 14:27 by henrypijames
What?! Sudoku *and* aquarium *and* skyscraper? To quote Simon A.: "How do you come up with something like that?"
Though the two metaphors really don't mix, do they: Aquarium means the grid is a sideway view, top is high, bottom is low. Whereas skyscraper means the grid is a birds-eye view, altitude is described by the digits. Maybe you can find a better metaphor that combines the two, especially if you plan to create more puzzles of this type.
As a starting idea, the digit could represent bundles of leaves and schools of fishes respectively, with larger ones obscuring smaller ones below or behind it.
on 23. June 2020, 21:19 by Sam Knott
Added Penpa link