Mar 08 - Hard
Puzzle Copyright © Kevin Stone
Share link – www.brainbashers.com
Reasoning
R8C3 can only be <7>
R8C9 is the only square in row 8 that can be <2>
R9C5 is the only square in row 9 that can be <2>
R8C1 is the only square in column 1 that can be <4>
R1C3 is the only square in column 3 that can be <5>
R1C1 is the only square in row 1 that can be <9>
R4C1 can only be <3>
R1C9 is the only square in row 1 that can be <3>
R2C4 is the only square in row 2 that can be <9>
R3C6 is the only square in column 6 that can be <6>
R6C7 is the only square in column 7 that can be <2>
R5C4 is the only square in column 4 that can be <2>
R7C4 is the only square in column 4 that can be <5>
Squares R4C2 and R4C3 in row 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R4C6 - removing <9> from <589> leaving <58>
R4C8 - removing <9> from <4589> leaving <458>
R5C6 is the only square in column 6 that can be <9>
R4C6 is the only square in column 6 that can be <5>
R5C8 is the only square in column 8 that can be <5>
R6C8 is the only square in column 8 that can be <9>
Intersection of row 1 with block 3. The value <6> only appears in one or more of squares R1C7, R1C8 and R1C9 of row 1. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
R2C7 - removing <6> from <5678> leaving <578>
R2C9 - removing <6> from <568> leaving <58>
Intersection of column 3 with block 7. The value <6> only appears in one or more of squares R7C3, R8C3 and R9C3 of column 3. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain this value.
R7C2 - removing <6> from <1368> leaving <138>
R9C1 - removing <6> from <168> leaving <18>
R9C2 - removing <6> from <1689> leaving <189>
Intersection of column 9 with block 9. The value <1> only appears in one or more of squares R7C9, R8C9 and R9C9 of column 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.
R7C8 - removing <1> from <14678> leaving <4678>
R8C8 - removing <1> from <18> leaving <8>
R8C6 can only be <1>
R4C8 can only be <4>
R4C5 can only be <8>
R5C9 can only be <6>
R6C9 can only be <8>
R6C4 can only be <1>
R2C9 can only be <5>
R7C6 can only be <8>
R9C9 can only be <1>
R1C5 can only be <1>
R6C5 can only be <7>
R3C4 can only be <8>
R6C2 can only be <6>
R5C5 can only be <4>
R9C1 can only be <8>
R7C9 can only be <4>
R1C8 can only be <6>
R1C7 can only be <8>
R7C8 can only be <7>
R3C1 can only be <7>
R3C8 can only be <1>
R7C7 can only be <6>
R9C2 can only be <9>
R9C3 can only be <6>
R4C2 can only be <2>
R9C7 can only be <5>
R7C3 can only be <3>
R2C7 can only be <7>
R2C1 can only be <6>
R2C2 can only be <8>
R3C7 can only be <4>
R5C1 can only be <1>
R4C3 can only be <9>
R3C2 can only be <3>
R5C2 can only be <7>
R7C2 can only be <1>
R3C3 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.