Zip-line Tower
- Kropki dots
- Zipper lines
- Odd and even cells
The brief
Standard sudoku rules apply: each row, column, and 3x3 box must contain all the digits from 1 to 9.
Magenta lines are zipper lines: digits in cells equidistant from the center of a line sum to the value of the digit in the center cell of the line. Different shades are used to distinguish distinct lines.
A white dot separates cells with consecutive digits. A black dot separates cells with digits in a 1:2 ratio.
A grey square denotes a cell which contains an even digit.