Kropki Entropy
Rules:
- Classic Sudoku:
Every row, column and 3x3 box must contain every number from 1 to 9.
- Entropic Lines:
Every sequential group of 3 cells on a line must have a low digit {1,2,3}, a medium digit {4,5,6}, and a high digit {7,8,9}.
- Kropki:
Digits separated by a white dot are consecutive; digits separated by a black dot have a 1:2 ratio.
Play it online in SudokuPad.
This puzzle is also on Logic Masters Germany.