Clear Kropki-Vision
- Kropki dots
- Arrows
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.
- Arrows: Digits on an arrow sum to the digit in the circle from which the arrow emerges. (The solution check requires filling also the arrow circles.)
- Skyscrapers: Digits outside the grid count the number of digits visible looking into the grid from their vantage points in their respective rows. Digits are visible when they are larger than all the digits before them.
- Visible Kropki: Digits joined by a black dot have a 1:2 ratio. Moreover, any digit on a black Kropki dot is visible from at least one vantage point outside of the grid. In other words: If a digit X is on a Kropki dot, there must be at least one straight connection to the edge of the grid consisting entirely of digits lower than X.