Nov 27 - Very Hard
Puzzle Copyright © Kevin Stone
Share link – www.brainbashers.com
Reasoning
R5C3 can only be <5>
R5C5 can only be <3>
R5C7 can only be <4>
R3C5 can only be <9>
R7C5 can only be <2>
R1C7 is the only square in row 1 that can be <1>
R2C3 is the only square in row 2 that can be <7>
R3C8 is the only square in row 3 that can be <6>
R3C6 is the only square in row 3 that can be <8>
R6C2 is the only square in row 6 that can be <1>
R6C7 is the only square in row 6 that can be <6>
R8C6 is the only square in row 8 that can be <1>
R7C6 can only be <3>
R2C6 can only be <5>
R7C1 is the only square in row 7 that can be <1>
Intersection of column 1 with block 1. The value <5> only appears in one or more of squares R1C1, R2C1 and R3C1 of column 1. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
R3C2 - removing <5> from <2345> leaving <234>
Intersection of column 3 with block 7. The value <3> 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.
R8C2 - removing <3> from <2359> leaving <259>
Intersection of block 3 with column 9. The value <5> only appears in one or more of squares R1C9, R2C9 and R3C9 of block 3. These squares are the ones that intersect with column 9. Thus, the other (non-intersecting) squares of column 9 cannot contain this value.
R7C9 - removing <5> from <459> leaving <49>
Squares R3C1 and R9C1 in column 1 and R3C9 and R9C9 in column 9 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in rows 3 and 9 can be removed.
R3C2 - removing <2> from <234> leaving <34>
R9C3 - removing <2> from <2349> leaving <349>
R9C7 - removing <2> from <239> leaving <39>
Squares R3C2 and R3C4 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <34>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R3C9 - removing <4> from <245> leaving <25>
Squares R1C3 and R1C9 in row 1 and R9C3 and R9C9 in row 9 form a Simple X-Wing pattern on possibility <4>. All other instances of this possibility in columns 3 and 9 can be removed.
R7C9 - removing <4> from <49> leaving <9>
R7C4 can only be <7>
R9C7 can only be <3>
R8C4 can only be <9>
R8C3 is the only square in row 8 that can be <3>
R8C8 is the only square in row 8 that can be <7>
R4C3 is the only square in column 3 that can be <2>
R4C2 can only be <9>
R4C7 can only be <5>
R6C3 can only be <8>
R4C8 can only be <8>
R8C7 can only be <2>
R6C8 can only be <9>
R2C8 can only be <4>
R8C2 can only be <5>
R2C7 can only be <9>
R9C9 can only be <4>
R9C3 can only be <9>
R1C9 can only be <5>
R7C8 can only be <5>
R1C1 can only be <9>
R3C9 can only be <2>
R2C4 can only be <3>
R3C1 can only be <5>
R7C2 can only be <4>
R9C1 can only be <2>
R1C3 can only be <4>
R3C2 can only be <3>
R2C2 can only be <2>
R3C4 can only be <4>
Today's Sudoku Puzzles
All daily items change at midnight GMT – set your local time zone.
Note: BrainBashers has a Dark Mode option – I recommend not using your browser's dark mode or extensions for BrainBashers