The grey line is an Infinite Looping Palindrome. From a certain point(s) to be determined by the solver the numbers in both directions are the same forever.
Cells a chess knight's move apart cannot contain the same digit.
The nine digits on the main diagonal starting top left sum to twenty-five.
Cell with grey circle is odd.
Cells joined by black dot are in the ratio 1:2.
Cells joined by X sum to ten.
Not all dots or Xs are given
Solve online:Sudokupad
Lösungscode: top row
am 28. März 2026, 16:17 Uhr von Inge
That was fun. Thanks
am 28. März 2026, 16:17 Uhr von Inge
That was fun. Thanks
am 19. März 2026, 23:14 Uhr von dzamie
I'm quite glad it doesn't take too long to figure out where the "ends" of the loop are.
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