Sudoku is The King by Justin Vitanza, App variant is FOG


The King's Law states that for a digit X, exactly X instances of the digit X are a king's move away from another instance of the digit X. However, two of the digits 1-9 (to be deduced) are rebellious and do not abide by this law. In fact, a rebellious digit is never a king's move away from another instance of itself. The grid is partially covered with fog. Correctly placed digits will clear the fog around that cell.