Logic Masters Deutschland e.V.

I played some great puzzles last year with the Doppelgänger rules and wanted to make one of my own ever since. This is it.

Doppelgänger:
- Every row, column, and box contains a 0, as well as eight out of the nine digits from 1 to 9 (ie, it's missing one digit).
- No two rows, no two columns, and no two boxes may be missing the same digit.
- For each 0 in the grid, the digits missing in its row, its column, and its box must be three different digits.

Yin Yang:
Shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2x2 area is fully shaded or fully unshaded. Additionally, in this puzzle all digits in the shaded cells are on a dutch whisper, where orthogonally neighboring digits must differ by at least 4.

X-Sums:
Clues outside of the 9x9 grid are standard X-sum clues. All cells included in the same X-sum have the same shading.

Circles:
Cells with a circle show the number of cells they 'see' (including the cell itself) that have the same shading. Cells with a different shading block the view.
All possible circles have been given.

As always, have fun!

Play this puzzle online in Sudokupad

I do advice players to go to the settings and turn of the Conflict Checker (under Gameplay) for this puzzle!