This puzzle originates from a cube-themed slow setting competition hosted by Tyrgannus on the CTC Discord.
Place digits 1-9 such that digits do not repeat in any 3x3 region nor within the portion of any row or column contained within three adjacent regions.
Arrow: Digits along an arrow must sum to the digit in the connected circle.
Dutch Whispers: Adjacent digits along an orange line must differ by at least 4.
Kropki Pairs: Cells connected by a black dot contain digits in a 1:2 ratio. Cells connected by a white dot contain consecutive digits.
Play online:
Penpa+
Solution code: Top row of the vertical faces (12 digits)
on 29. July 2025, 18:35 by bansalsaab
Hi SSG, Wonderful puzzle. it was easy once you get the hang of it.
can you explain the solution code please? I cant understand which one is vertical face?
-Apologies for the confusion. If you look at the shape as a cube, there's a top face, which is fully horizontal, and two side faces, which are vertical. The solution code is the string of cells along the top edge of the two side faces (i.e. the row that contains no clues except a whisper line ending in the 10th cell). Hope this helps. -SSG
-- Thanks SSG. for some reason I thought I had 16 digits in vertical face :-) and asked without even trying the solution. Again, an amazing original. looking forward to variations in this ruleset.
Please note: The German version of this page has changed. It is possible that this page does not contain the latest information.