Logic Masters Deutschland e.V.

Normal sudoku rules apply; i.e. the digits 1 to 9 need to be placed, once each, in every row, column, and 3x3 box. Additionally the positions of the cells in the 3x3 boxes form disjoint groups that require their own set of the digits 1-9, i.e. the top left hand corner of each 3x3 box forms a set of the digits 1-9.

There are some circles in the grid which occupy the corners between some cells. Digits in these circles must all appear at least once in the cells touching them.

Digits in the gray circles must be odd.

Cells separated by a black dot must be in a 2:1 ratio, Cells separated by a white dot must be consecutive.

The sum of digits along a "double arrow" line is equal to the sum of digits in the circles at either end of the line.

The black circles in some cells are counting circles. If a digit appears in a black circle, it is counting how many times that digit appears in black circles. i.e. if R5C1 were a 2, 2 would need to appear once more in a black circle.

Ball Pit puzzle