Zippows
The brief
- Normal sudoku rules apply, i.e. each row, column, and 3x3 region has to contain the digits from 1 to 9 once each.
- Zippers: On a lavender line, the digits on the ends sum to the digit at its center.
- Skyscraper Arrows: A digit on an arrow indicates the number of digits visible in the direction that it is pointing at. Digits are visible when they are larger than all the digits before them. (The digit on the arrow does not count itself.)