Logic Masters Deutschland e.V.

Rules: Normal sudoku rules apply.

Kroopki Doots: Sets of digits separated by a white Kroopki doot (an elongated dot) must have their respective sums be consecutive. Sets of digits separated by a black Kroopki doot must have their respective sums be in a 1:2 ratio.

The white doot is valid since 10 (1+9) and 9 (3+6) are consecutive. The black doot is valid since 10 (1+4+5) and 20 (4+7+9) are in a 1:2 ratio.

Quad Parity Sums: A number in a circle gives the sum of the even digits or the sum of the odd digits in the four surrounding cells.

These are some valid fills for a 6 clue, since on the left the odds (3+3) sum to 6, and on the right the evens (6) sum to 6.

Puzzle:

Play on SudokuPad

If you enjoy the parity sum logic, you might enjoy my Twisted Sandwiches and Split X-Sums