Tentro Quadtropy
(Published on 2. January 2026, 05:40 by Scojo)
Rules:
- Quattroquadri: Place a digit from 1-9 into each cell so that digits don't repeat in rows, columns, or boxes.
- Regional Constraints: Each constraint type may contain no repeated digits anywhere in the puzzle.
- Tentropy Lines: Every set of 4 adjacent digits on a hollow peach line must contain a digit from each of the X-pair (ten-pair) subsets of {1,9}, {2,8}, {3,7}, and {4,6}. A 5 may not appear on a Tentropy Line. If a Tentropy Line contains fewer than 4 digits, those digits must be from different subsets.
- Renban: Digits on a pink line form a consecutive set of digits in any order.
- Thermo: Digits on a thermometer increase from bulb to tip.
- X: Digits on an X sum to 10.
- V: Digits on a V sum to 5.
Solve in SudokuPad
Solution code: Row 1
Last changed on on 2. January 2026, 05:57
Solved by ranhothchord, maniacaljackal, MSDOS, jalebc, phil_the, unlogical, pepe74287, AKernel, Exigus, abs, Sinuit, dorverbin, scushuaishuai, drmegadude, sparkymanu, juggler, nunc, gdc, SKORP17, NEWS, SennyK, ... ordnanceordinance, cultivatedinrows, Nagesh, Deivi55, Yahhavp, TeddieMilo, Tompzini, ana_shadow, timww572, chinesemaster, Crul, Clementi, karlmortenlunna, achambers2010, abadx, drf93, AgedDolls
Comments
on 13. January 2026, 21:29 by faltenin
A very nice interaction of constraints.
on 3. January 2026, 15:13 by sujoyku
Very nice puzzle! Thank you, Scojo!
Last changed on 3. January 2026, 01:38
on 3. January 2026, 01:38 by Börst
Took me 80 minutes, but it was very nice. I guess i didnt notice something obvious, my whole board was colored before i put the first digit :D
on 2. January 2026, 20:50 by gdc
Very neat how the regional constraints play together with the QQ!
on 2. January 2026, 20:43 by juggler
Lovely puzzle!
