Entropic Reflections
- Kropki dots
- XV and number dots
- Arrows
- Whisper lines
- Same-class lines
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.
- Entropy Mirror: The diagonal from r1c1 to r9c9 acts as an entropy mirror. Each cell has the same entropy as the cell reflected in the mirror, i.e. if r2c6 contains a low digit (from 123), then r6c2 must also have a low digit.
The remaining rules are standard. Feel free to skip them if you are familiar with XV, Kropki, GW and Arrows.
- XV: Digits joined by an X sum to 10. Digits joined by a V sum to 5. (Not all XV are given.)
- Kropki: Digits joined by a black dot have a 1:2 ratio. Digits joined by a white dot are consecutive. (Not all dots are given.)
- German Whispers: Adjacent digits on a green line must have a difference of at least 5.
- Arrows: Digits on an arrow sum to the digit in the circle from which the arrow emerges.