RULES: Place the digits 1-9 into each row, column and boldly marked area so that they all contain each digit once. Additionally, Kropki dots are placed in the grid. Kropki rules are applied only along the grey line (orthogonally or diagonally).
Kropki Rules : Adjacent cells containing digits whose difference is 1 are marked with a white circle. Adjacent cells containing digits whose ratio is 2 are marked with Black circle. Adjacent cells containing digits 1 and 2 may be marked by white or black circle. Adjacent cells with no marking must not contain digits whose difference is 1 or whose ratio is 2.