This is my entry for turn 7 of season 1 of The Skunkworks League, hosted by damasosos92. In this round, the prompt was to create a quattroquadri puzzle using only standard local constraints, with a target difficulty of 2 or 3 stars. At least 8 different constraints must be used, and each constraint type can only be used once.
Rules:
Quattroquadri: Place the digits 1 to 9 once each into the 3x3 boxes. Digits may not repeat in the same row, column, or box.
Standard X pairs, Kropki pairs, Arrow, German Whispers, Renban, Region Sum Line, Entropic Line, Modular Line, and Numbered Rooms rules apply.
X Pairs: Digits separated by an X sum to 10.
Kropki Pairs: Digits separated by a black dot must be in a 2:1 ratio. Digits separated by a white dot must be consecutive.
Arrow: Digits on an arrow must sum to the digit placed in that arrow's circle.
German Whispers: Adjacent digits on a green line (also marked with a G) must have a difference of at least 5.
Renban: Digits placed on a purple line (also marked with an R) must be a non-repeating set of consecutive digits, in any order.
Region Sum Lines: 3x3 box borders divide blue lines (also marked with an S) into segments with equal sums.
Entropic Lines: Each set of three adjacent digits along a beige line (also marked with an E) must be one low [123], one medium [456], and one high digit [789].
Modular Lines: Each set of three adjacent digits along a teal line (also marked with an M) must be one each from the sets [147], [258], and [369].
Numbered Rooms: A clue outside the grid indicates the digit which has to be placed in the Nth cell in the corresponding direction, where N is the digit placed in the first cell in that direction.
Lösungscode: Row 6
am 24. August 2025, 01:40 Uhr von damasosos92
Lovely puzzle!
am 7. August 2025, 10:05 Uhr von davidz32z
Took me ages to find the break in, but it's quite clever in the end! Lots of logic that doesn't result in a digit placed before you can get there.
am 2. August 2025, 11:04 Uhr von Snookerfan
Fun and smooth, thank you!
am 2. August 2025, 09:51 Uhr von Franjo
Confusing - but that was the task! Thank you very much for creating and sharing this lovely puzzle.
am 2. August 2025, 08:04 Uhr von marcmees
nice. Thanks
am 2. August 2025, 06:58 Uhr von Piatato
Nice!
am 2. August 2025, 03:56 Uhr von Agent
Very smooth!