My advice for solving this puzzle is to use coloring to keep track of air and water cells, and use the line tool in Penpa to keep track of what cells must be part of the same region. In my experience, it is the best way to save headache. In this ruleset it is also exceptionally easy to make mistakes, so be sure to double and triple check any difficult deductions you may come across.
Lösungscode: The air cells in the bottom 4 rows, left to right, top to bottom.
Gestern, 19:32 Uhr von lerroyy
Very hard puzzle, but very nice!
Gestern, 13:25 Uhr von Statistica
Ganz großartig. Hat eine Menge Spaß gemacht.
am 24. Juni 2022, 22:05 Uhr von henrypijames
I'm glad I was undeterred by the difficulty warning and did this puzzle cold - without the 7×7 warm-up. It was more fun this way, and only 4½ difficulty for me regardless.
am 24. Juni 2022, 20:55 Uhr von Niverio
Brutal, and I was 13 minutes too slow... RIP.
am 24. Juni 2022, 12:18 Uhr von marcmees
great challenge. Fulfilled my expectations completely. thanks.
am 24. Juni 2022, 02:03 Uhr von Elliptical
Excellent puzzle. A solid 5 star for difficulty. Every little deduction required some effort. The irregular sudoku at the end of the solution was also challenging. One of your best puzzles, in my opinion. I'm looking forward to Simon's video :)
am 23. Juni 2022, 21:47 Uhr von blazedy
am 23. Juni 2022, 17:01 Uhr von Isa
beautiful puzzle really enjoyed solving it :)
am 23. Juni 2022, 16:56 Uhr von Vebby
Consistently challenging with interesting and enjoyable deductions throughout. Very nice exploration of the rule-set. Thanks KNT! :)
Thanks Vebby! I tried my best to make sure the puzzle utilized the ruleset in every way it could, with a variety of deductions included in the solving path.
am 23. Juni 2022, 16:09 Uhr von MagnusJosefsson
Great puzzle, very consistently challenging and enjoyable!
I'm glad you enjoyed it, Magnus!
am 23. Juni 2022, 13:18 Uhr von polar
Wonderful - thanks!
Thank you polar, I'm glad this was able to scratch an itch for a solver like you that goes through dozens of puzzles a week :)
am 23. Juni 2022, 11:29 Uhr von PixelPlucker
Wow, that was a proper challenge. Loads of beautiful logic, thanks!
Thanks for the solve PixelPlucker! I know we talked about this puzzle already a bit- but I seriously had a lot of fun setting it, despite the very long time it took. Glad you enjoyed it too!
am 23. Juni 2022, 11:21 Uhr von Jesper
Great puzzle, remains challenging until the end. Thanks!
Thank you Jesper! I am glad you found it consistently challenging to the end.
am 23. Juni 2022, 10:58 Uhr von Steven R
Ow, my brain! This puzzle doesn't give anything up easily. Thanks KNT!
Hah! That reaction is *exactly* what I was going for. Thanks for the solve, Steven!
am 23. Juni 2022, 08:05 Uhr von RJBlarmo
Really fun challenge! Very easy to make a mistake on this and I had to restart a few times. Extremely satisfying when everything finally falls into place at the end.
Congratulations on the solve! I'm glad you persevered even after having to restart the puzzle several times.