Feb 20 - Very Hard
Puzzle Copyright © Kevin Stone
Share link – www.brainbashers.com
Reasoning
R8C8 can only be <7>
R2C8 can only be <8>
R5C8 can only be <3>
R7C7 can only be <9>
R7C9 can only be <4>
R9C7 can only be <3>
R9C9 can only be <8>
R1C9 is the only square in row 1 that can be <6>
R1C6 is the only square in row 1 that can be <8>
R1C3 is the only square in row 1 that can be <9>
R3C1 is the only square in row 3 that can be <3>
R3C5 is the only square in row 3 that can be <5>
R4C4 is the only square in row 4 that can be <3>
R5C4 is the only square in row 5 that can be <5>
R5C6 is the only square in row 5 that can be <6>
R5C5 is the only square in row 5 that can be <8>
R5C3 is the only square in row 5 that can be <4>
R4C5 is the only square in row 4 that can be <4>
R6C1 is the only square in row 6 that can be <8>
R7C1 is the only square in row 7 that can be <6>
R9C1 is the only square in row 9 that can be <4>
R9C4 is the only square in row 9 that can be <9>
R6C5 is the only square in row 6 that can be <9>
Intersection of column 7 with block 3. The value <1> only appears in one or more of squares R1C7, R2C7 and R3C7 of column 7. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
R3C9 - removing <1> from <127> leaving <27>
Intersection of block 7 with column 3. The value <7> only appears in one or more of squares R7C3, R8C3 and R9C3 of block 7. These squares are the ones that intersect with column 3. Thus, the other (non-intersecting) squares of column 3 cannot contain this value.
R3C3 - removing <7> from <127> leaving <12>
Intersection of row 3 with block 3. The value <7> only appears in one or more of squares R3C7, R3C8 and R3C9 of row 3. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
R1C7 - removing <7> from <127> leaving <12>
Squares R1C1 and R5C7 form a remote naked pair. <27> can be removed from any square that is common to their groups.
R1C7 - removing <2> from <12> leaving <1>
R1C4 can only be <7>
R1C1 can only be <2>
R6C4 can only be <1>
R2C5 can only be <1>
R2C2 can only be <7>
R8C5 can only be <2>
R8C2 can only be <1>
R7C5 can only be <7>
R4C1 can only be <7>
R3C3 can only be <1>
R5C2 can only be <2>
R9C3 can only be <7>
R4C6 can only be <2>
R4C9 can only be <1>
R6C6 can only be <7>
R5C7 can only be <7>
R3C7 can only be <2>
R6C9 can only be <2>
R9C6 can only be <1>
R3C9 can only be <7>
R7C3 can only be <2>
Today's Sudoku Puzzles
All daily items change at midnight GMT – set your local time zone.
Note: BrainBashers has a Dark Mode setting.