In celebration of George Boole's 200th birthday, and Bram de Laat's excellent
Clone Or Extra Region Sudoku, I give you Clone And Extra Region Sudoku. Enjoy!
Rules: the two shaded regions contain each of the numbers 1-9 exactly once. Moreover, the same numbers go in cells with the same relative position in the two regions.
#325 Extra Region And Clone Sudoku – rated hard
All puzzles © Tom Collyer 2009-15.