Logic Masters Deutschland e.V.

Rules
Standard sudoku rules apply.

V: Cells separated by a V sum to 5.

Killer: Digits in a cage sum to the given total.

Yin-yang: Shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2 by 2 area is fully shaded or unshaded.

13 sums: In each row and column every stretch of 2 or more adjacent shaded cells sums to 13. See example below.

Circles: A digit in a circle gives the number of cells in the (up to) 9 surrounding cells, including itself, that are shaded. All possible circles are given.


Example with 10 sums in a 6x6 sudoku: In each row and column every stretch of 2 or more adjacent shaded cells sums to 10.




Link: Play on CtC