Gear Shift
- Kropki dots
- XV and number dots
- Modular lines
- Entropy windows
The brief
- Normal Sudoku rules apply.
- Modular lines - every three digits along a teal modular line must have a digit from each of the following sets - [1,4,7], [2,5,8], and [3,6,9].
- Global entropy - every 2 by 2 box of cells must have at least one low digit (1,2,3), one medium digit (4,5,6), and one high digit (7,8,9).
- Ratio Kropki dots - digits separated by a black Kropki dot have a value ratio of 1:2. No negative constraint.
- X sums - digits separated by an X sum to a value of 10. No negative constraint.
