Logic Masters Deutschland e.V.

Normal sudoku rules apply.

Cells separated by a chess knight's move cannot contain the same digit.

Cells separated by an X must contain digits summing to 10; cells separated by a V must contain digits summing to 5. Not all Xs and Vs are shown.

Circled numbers must appear in at least one of the four cells touching that circle.

Each main diagonal cannot contain a repeated digit.

Try out the Big X on f-puzzles.

Or, if you'd prefer, give it a try on the CTC App.