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Daily Sudoku Answer 



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Mar 24 - Very Hard
Puzzle Copyright © Kevin Stone

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Reasoning 



R4C4 can only be <2>

R4C1 can only be <8>

R4C6 can only be <3>

R6C6 can only be <5>

R6C4 can only be <6>

R9C6 can only be <2>

R1C6 can only be <8>

R4C9 can only be <7>

R5C5 can only be <7>

R1C7 is the only square in row 1 that can be <6>

R2C8 is the only square in row 2 that can be <7>

R3C1 is the only square in row 3 that can be <3>

R5C7 is the only square in row 5 that can be <3>

R5C1 is the only square in row 5 that can be <6>

R5C3 is the only square in row 5 that can be <5>

R7C5 is the only square in row 7 that can be <6>

R7C9 is the only square in row 7 that can be <9>

R3C5 is the only square in row 3 that can be <9>

R1C8 is the only square in row 1 that can be <9>

R9C3 is the only square in row 9 that can be <7>

R2C1 is the only square in column 1 that can be <5>

R1C3 is the only square in column 3 that can be <1>

R8C9 is the only square in column 9 that can be <5>

Intersection of row 3 with block 3. The value <4> 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.

R2C9 - removing <4> from <248> leaving <28>

R3C9 is the only square in column 9 that can be <4>

Intersection of column 1 with block 7. The value <4> only appears in one or more of squares R7C1, R8C1 and R9C1 of column 1. 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 <4> from <1234> leaving <123>

R9C2 - removing <4> from <1348> leaving <138>

Intersection of column 9 with block 6. The value <1> only appears in one or more of squares R4C9, R5C9 and R6C9 of column 9. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.

R5C8 - removing <1> from <128> leaving <28>

Squares R3C3 and R7C3 in column 3 and R3C7 and R7C7 in column 7 form a Simple X-Wing pattern on possibility <2>. All other instances of this possibility in rows 3 and 7 can be removed.

R7C1 - removing <2> from <24> leaving <4>

R8C5 is the only square in row 8 that can be <4>

R2C5 can only be <2>

R9C4 can only be <5>

R9C5 can only be <3>

R1C4 can only be <4>

R1C2 can only be <2>

R2C9 can only be <8>

R1C5 can only be <5>

R2C2 can only be <4>

R3C7 can only be <2>

R3C3 can only be <8>

R7C7 can only be <8>

R7C3 can only be <2>

R9C7 can only be <4>

R9C8 can only be <1>

R9C2 can only be <8>

R8C8 can only be <2>

R5C2 can only be <1>

R5C9 can only be <2>

R8C2 can only be <3>

R6C1 can only be <2>

R5C8 can only be <8>

R6C9 can only be <1>

R8C1 can only be <1>



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