1. Never 4: it’s basic sudoku, but with a 0 and no 4. Place the digits 0 to 9 (but never 4) in every row, column, and box.
2. Kropka* dot: A black kropka dot separates orthogonally adjacent digits that share a 1:2 ratio. The only possible black dot in the grid is given.
3. Circle sum: A digit in a circle indicates the number of circles that contain the digit.
4 Arrows: Some of the circle sum circles are arrow circles. Digits along a circle’s attached arrow do not repeat, are not themselves in circles, and sum to the digit in that circle.
5. Fog covers the grid. Correctly placing a digit in a cell clears the fog in the surrounding cells. No guessing is required.
Don’t forget: there are no other black dots. Digits on arrows do not repeat, and a number in a circle indicates the number of circles that contain the number.
* I believe kropka is the singular and kropki is the plural. Because the puzzle only has one dot I decided to call it a kropka dot.
Lösungscode: Row 1
am 9. Dezember 2024, 20:16 Uhr von Jrosas
Removed unnecessary clue
am 17. November 2024, 20:03 Uhr von ostio456
One of my favourite puzzles I've completed recently. thanks!
[You are too kind. You’ve solved some great setters’ puzzles recently. I will return to this comment when the 1-star trolls discourage me.]
am 14. November 2024, 18:02 Uhr von VitP
for me, the hardest rule to keep track of was never 4, because it's such a rare constraint.
I thought of the rule when I set a puzzle I called “Poet Himself.” Since then I’ve set 8 others using various constraints. Killer cages, black and white Kropki, German Whisper, anti-German whisper (“Namreg”), X-sum, renban. It is fun how “Never 4” puts constraints on the other constraints and allows things like a single black dot.
am 14. November 2024, 01:51 Uhr von Nickd88
I kept forgetting the no other black kropki rule. Once I remembered it I'd solve a bunch then forget it again. Great puzzle. Tons of fun
am 13. November 2024, 22:02 Uhr von hardline35
Nice puzzle! Thanks.
If you are stuck, remember no other black kropki is allowed.
[good tip. Also the circle rule. Thanks for the comment and thanks to people who are raising the like rating average from whoever had put it at 82%]
am 13. November 2024, 04:37 Uhr von Sralser
I believe there are 2 solutions with the 2s and 3s in boxes 3 and 6?
Reversing the 2s and 3s in those rows would result in 3’s next to 6’s and a 2 next to a 1. That would require four more kropkis than the rules allow.