Logic Masters Deutschland e.V.

Lore (you may skip below the image if you are looking for the rules):

As of the very moment this puzzle is released, on 20th of March 2025 10:01am CET, it is currently Equinox and the sun is directly above the equator of the earth. Happy solving, and happy spring! (or autumn if you are in the Southern hemisphere)

Rules:

Normal Sudoku rules apply: Place the digits 1-9 in every row, column and 3x3 box once each.

Yin-Yang: Shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are also orthogonally connected, and no 2x2 region is made up of only shaded or only unshaded cells. Digits in shaded cells have a negative value (multiplied by -1).

Kropki: Values of the cells separated by a black dot must be in a 1:2 or -1:2 ratio.
Killer: Values of the cells in a cage must not repeat and add up to the sum indicated on the top left corner of the cage.
Arrow:: Sum of the values of cells on an arrow equal the value of the circled cell.
Dutch Whispers: Consecutive cells on a pink-yellow line must have a difference of at least 4 between their values.
Region Sum Lines: Values of the cells on the blue-green line have an equal sum N within each box it passes through.
XV: Values of the cells separated by an X must have a DIFFERENCE of 10. Values of the cells separated by a V must have a DIFFERENCE of 5.

Play on SudokuPad