Normal Sudoku rules and the marked diagonal contains the digits 1-9 as well.
Cells with a gray square must contain an even digit.
Kropki
Cells connected by a white dot contain consecutive digits; cells connected by a black dot contain digits in a 1:2 ratio. Not all possible dots are given.
Little Killer
Clues outside the grid show the sum of the digits along the indicated diagonal. Digits can repeat along this diagonal if allowed by the other rules.
Killer
Digits in cages do not repeat and sum to the small number in the top left corner of the cage.
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Solution code: row 9 and column 1
on 7. July 2024, 11:03 by mezkur7
Sudokupad(w/sol): https://sudokupad.app/me7zve0pl2
on 24. October 2021, 12:37 by Florian Wortmann
Added ctc-app link
on 8. August 2021, 16:23 by Florian Wortmann
fixed tags
on 27. June 2021, 12:04 by Vebby
Great fun! I loved how the constraints fed into each other.
on 6. June 2021, 17:13 by chris21
Clever break-in combining the constraints.