Logic Masters Deutschland e.V.

I hope that chaos before Christmas is already gone! I wish you all Merry Christmas ❤️
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Chaos construction: Divide the grid into nine orthogonally connected nine-cell regions, and place the digits 1 to 9 once in each row, column, and region.

Region separation: Each 2 digits directly adjacent on any inside-grid constraint (i.e., X-Sums and Sandwich excluded) must belong to separate regions.

X-Sums: A star outside the grid gives the sum of the first X digits of its column from the direction of the star, where X is the digit placed in the cell next to the star.

Sandwich: A gift outside the grid gives the sum of the digits appearing between the 1 and the 9 in its column.

Palindrome: Digits along a gray line read the same in both directions.

German whisper: Adjacent digits along a green line have a difference of at least 5.

Parity: Adjacent digits along a red line alternate between odd and even.

Renban: Digits along a purple line form a set of non-repeating consecutive digits in any order.

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

Kropki dots: Digits in cells joined by a white dot with 7 have difference of 7. Digits in cells joined by a black dot are in a 1:2 ratio (i.e., one digit will be double the other). All dots satisfying the region separation rule are given (i.e., if two orthogonally adjacent digits are in 1:2 ratio or have difference of 7, but there is no dot between them, they belong to the same region).

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