Logic Masters Deutschland e.V.

VI / XI is a variant Sudoku featuring Anti-King, Anti-Knight, and a complete VI/XI constraint.

Sudoku:
Place the digits 1–9 in every row, column, and 3×3 box, with no repeats.

Anti-King:
Equal digits may not be a king's move apart.

Anti-Knight:
Equal digits may not be a knight's move apart.

VI / XI:
Orthogonally adjacent digits that sum to 6 are marked with VI.
Orthogonally adjacent digits that sum to 11 are marked with XI.
All possible VI and XI clues are given. Therefore, orthogonally adjacent cells without a VI or XI may not sum to 6 or 11.

Black Kropki:
Digits separated by a black dot are in a 1:2 ratio.
Not all possible black Kropki dots are necessarily given.

Play online:
Solve in SudokuPad

I hope you enjoy it!

More puzzles by me can be found at UncleLogic.com.