(17.09.2019, 18:44)rob schrieb: 4.10 Three is a crowd

Does a "wrong" clue simply not count, or is the corresponding number not allowed to appear in the next three cells?

(18.09.2019, 00:36)detuned schrieb: 4.10 Three is a crowd - is it guaranteed that all 36 triplets of clues will be given?

(18.09.2019, 16:44)pwahs schrieb: A bit of a pedantic question, but last year I didn't ask a pedantic question I thought of, and then people started writing negative numbers in their Sandglass puzzles and got away with it  
4.4 Hidden Skyscrapers Sudoku: 
I assume the rules want to express "All possible arrows are given"? The way it is written know you could take a cell with multiple arrows and leave out some, but not all of them.

(18.09.2019, 16:54)Richard schrieb:

(18.09.2019, 16:44)pwahs schrieb: A bit of a pedantic question, but last year I didn't ask a pedantic question I thought of, and then people started writing negative numbers in their Sandglass puzzles and got away with it  
4.4 Hidden Skyscrapers Sudoku: 
I assume the rules want to express "All possible arrows are given"? The way it is written know you could take a cell with multiple arrows and leave out some, but not all of them.

Yes, that is what is meant here.

... visible in all directions of the arrow(s). Would be a better instruction?

(18.09.2019, 17:18)pwahs schrieb:

(18.09.2019, 16:54)Richard schrieb:

(18.09.2019, 16:44)pwahs schrieb: A bit of a pedantic question, but last year I didn't ask a pedantic question I thought of, and then people started writing negative numbers in their Sandglass puzzles and got away with it  
4.4 Hidden Skyscrapers Sudoku: 
I assume the rules want to express "All possible arrows are given"? The way it is written know you could take a cell with multiple arrows and leave out some, but not all of them.

Yes, that is what is meant here.

... visible in all directions of the arrow(s). Would be a better instruction?

No, the problem is more that you are grouping all arrows in a cell in the same single "if and only" statement. I would just slap "All possible arrows are given." on the end to make it water tight.