Oct 26 - Hard
Puzzle Copyright © Kevin Stone
Share link – www.brainbashers.com
Reasoning
R4C8 is the only square in row 4 that can be <4>
R5C9 is the only square in row 5 that can be <8>
R8C2 is the only square in row 8 that can be <2>
R9C8 is the only square in row 9 that can be <2>
R2C6 is the only square in row 2 that can be <2>
R1C7 is the only square in row 1 that can be <2>
R3C3 is the only square in row 3 that can be <2>
R9C2 is the only square in row 9 that can be <8>
R7C1 is the only square in column 1 that can be <1>
R7C3 is the only square in row 7 that can be <4>
Intersection of row 3 with block 3. The value <1> 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.
R2C8 - removing <1> from <158> leaving <58>
R3C8 is the only square in column 8 that can be <1>
R3C1 is the only square in row 3 that can be <8>
R2C1 can only be <9>
Intersection of row 1 with block 2. The value <9> only appears in one or more of squares R1C4, R1C5 and R1C6 of row 1. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.
R3C6 - removing <9> from <5679> leaving <567>
Intersection of column 3 with block 4. The value <5> only appears in one or more of squares R4C3, R5C3 and R6C3 of column 3. These squares are the ones that intersect with block 4. Thus, the other (non-intersecting) squares of block 4 cannot contain this value.
R6C2 - removing <5> from <3579> leaving <379>
Squares R1C2<356>, R3C2<56> and R7C2<36> in column 2 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <356>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R4C2 - removing <36> from <3679> leaving <79>
R6C2 - removing <3> from <379> leaving <79>
R4C9 is the only square in row 4 that can be <3>
R4C7 is the only square in row 4 that can be <6>
R8C4 is the only square in row 8 that can be <3>
R9C3 is the only square in row 9 that can be <3>
R6C3 can only be <5>
R7C2 can only be <6>
R6C8 can only be <7>
R5C3 can only be <6>
R6C2 can only be <9>
R5C7 can only be <5>
R3C2 can only be <5>
R1C2 can only be <3>
R5C1 can only be <4>
R6C6 can only be <4>
R4C2 can only be <7>
R6C1 can only be <3>
R8C6 can only be <5>
R5C5 can only be <7>
R8C9 can only be <1>
R8C5 can only be <4>
R1C1 can only be <6>
R4C4 can only be <9>
R7C4 can only be <7>
R7C7 can only be <9>
R7C9 can only be <5>
R3C7 can only be <7>
R9C9 can only be <7>
R7C8 can only be <3>
R3C9 can only be <9>
R1C4 can only be <5>
R1C8 can only be <8>
R2C4 can only be <1>
R1C5 can only be <9>
R2C8 can only be <5>
R2C5 can only be <8>
R9C4 can only be <6>
R3C6 can only be <6>
R9C6 can only be <9>
R9C5 can only be <1>
R1C6 can only be <7>
Today's Sudoku Puzzles
All daily items change at midnight GMT – set your local time zone.
Note: BrainBashers has a Dark Mode setting.