Jul 24 - Hard
Puzzle Copyright © Kevin Stone
Share link – www.brainbashers.com
Reasoning
R2C4 is the only square in row 2 that can be <1>
R2C6 is the only square in row 2 that can be <9>
R3C5 is the only square in row 3 that can be <5>
R3C8 is the only square in row 3 that can be <7>
R7C9 is the only square in row 7 that can be <1>
R7C5 is the only square in row 7 that can be <9>
R1C5 is the only square in block 2 that can be <4>
R1C8 can only be <8>
R1C6 is the only square in row 1 that can be <2>
R3C6 can only be <3>
R3C3 can only be <2>
R5C6 can only be <8>
R9C4 is the only square in row 9 that can be <4>
R6C9 is the only square in column 9 that can be <8>
R7C7 is the only square in column 7 that can be <8>
Squares R9C2 and R9C5 in row 9 form a simple naked pair. These 2 squares both contain the 2 possibilities <36>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R9C1 - removing <36> from <3568> leaving <58>
R9C3 - removing <3> from <358> leaving <58>
Intersection of row 6 with block 4. The value <5> only appears in one or more of squares R6C1, R6C2 and R6C3 of row 6. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.
R4C1 - removing <5> from <2359> leaving <239>
R4C3 - removing <5> from <357> leaving <37>
R5C1 - removing <5> from <23459> leaving <2349>
Intersection of row 7 with block 7. The value <6> only appears in one or more of squares R7C1, R7C2 and R7C3 of row 7. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
R8C2 - removing <6> from <2367> leaving <237>
R9C2 - removing <6> from <36> leaving <3>
R9C5 can only be <6>
R8C6 can only be <7>
R8C2 can only be <2>
R6C6 can only be <6>
R7C4 can only be <2>
R7C1 can only be <6>
R8C4 can only be <3>
R5C4 can only be <5>
R4C4 can only be <7>
R7C2 can only be <7>
R3C1 can only be <4>
R3C9 can only be <6>
R2C2 can only be <6>
R2C8 can only be <4>
R4C3 can only be <3>
R5C8 can only be <1>
R2C3 can only be <8>
R6C1 can only be <5>
R5C2 can only be <4>
R6C3 can only be <7>
R9C1 can only be <8>
R9C3 can only be <5>
R2C1 can only be <3>
R6C2 can only be <1>
R6C5 can only be <3>
R6C7 can only be <4>
R5C5 can only be <2>
R8C7 can only be <6>
R8C8 can only be <5>
R4C7 can only be <9>
R8C9 can only be <4>
R4C8 can only be <6>
R4C1 can only be <2>
R4C9 can only be <5>
R1C7 can only be <3>
R5C9 can only be <3>
R5C1 can only be <9>
R4C5 can only be <1>
R1C9 can only be <9>
Today's Sudoku Puzzles
All daily items change at midnight GMT – set your local time zone.
Note: BrainBashers has a Dark Mode setting.