Tetrafolium
(Published on 17. February 2025, 15:40 by Myxo)
This is a Sudoku with standard variants, meant to showcase a certain idea. Multiple testers got completely stumped on this puzzle, thus I am submitting it as "very hard". However, I ensure you that there is a clean way through without required case-checking. Enjoy!
Rules:
Sudoku: Place the digits 1-9 exactly once in each row, column and box.
Killer: Digits in cages must sum to the indicated total. In some cases, only the parity of that total is given.
Thermo: Digits along grey thermometers must form a strictly increasing sequence, starting from the bulb.
German Whispers: Adjacent digits on a green line must differ by at least five.
Solution code: row 5
Comments
on 18. February 2025, 01:22 by askaksaksask
Given how much I've enjoyed your other puzzles, no surprise this was a home run for me. Really rewarding logic here, with a fairly well-telegraphed accounting problem, but moving from the initial labeling into the meat of the puzzle was hardly automatic. Really fun to break this one open, and can confirm no case checking necessary! Thank you for another brilliant entry.
on 17. February 2025, 23:48 by anyeyeball
Fantastic puzzle. Very nice, indeed. Thanks for your work, Myxo.
on 17. February 2025, 23:23 by Jesper
Very nice!
on 17. February 2025, 15:53 by Piatato
Very cool! I didn't find it brutal, but fascinating and enjoyable!
on 17. February 2025, 15:46 by Andrewsarchus
Brilliant setting!
on 17. February 2025, 15:43 by Bellsita
Very hard indeed. Almost broke me. But very very good.
