May 24 - Hard
Puzzle Copyright © Kevin Stone
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Reasoning
R4C1 can only be <2>
R4C4 can only be <3>
R4C5 is the only square in row 4 that can be <5>
R6C9 is the only square in row 6 that can be <3>
R5C8 is the only square in block 6 that can be <6>
Squares R6C1 and R6C4 in row 6 form a simple naked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R6C6 - removing <4> from <469> leaving <69>
Squares R6C5 and R6C6 in block 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R4C6 - removing <9> from <79> leaving <7>
R5C5 - removing <9> from <1279> leaving <127>
R5C6 - removing <9> from <2479> leaving <247>
R4C9 can only be <9>
R5C7 can only be <7>
R7C7 can only be <4>
R8C7 can only be <3>
R9C2 is the only square in row 9 that can be <3>
R9C8 is the only square in row 9 that can be <9>
Intersection of row 3 with block 1. The value <4> only appears in one or more of squares R3C1, R3C2 and R3C3 of row 3. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.
R1C1 - removing <4> from <145> leaving <15>
R1C2 - removing <4> from <12459> leaving <1259>
R2C1 - removing <4> from <4568> leaving <568>
R2C2 - removing <4> from <24589> leaving <2589>
R2C3 - removing <4> from <24689> leaving <2689>
R2C9 is the only square in row 2 that can be <4>
R1C9 can only be <7>
R1C8 can only be <5>
R8C9 can only be <6>
R9C9 can only be <8>
R1C1 can only be <1>
R9C1 can only be <6>
R9C6 can only be <2>
R7C3 can only be <8>
R9C4 can only be <1>
R5C6 can only be <4>
R1C6 can only be <9>
R6C4 can only be <8>
R6C1 can only be <4>
R7C2 can only be <1>
R5C3 can only be <9>
R5C4 can only be <2>
R8C5 can only be <7>
R1C2 can only be <2>
R6C6 can only be <6>
R5C2 can only be <8>
R5C5 can only be <1>
R1C4 can only be <4>
R8C1 can only be <5>
R6C5 can only be <9>
R7C8 can only be <7>
R7C5 can only be <6>
R8C8 can only be <1>
R2C1 can only be <8>
R8C2 can only be <4>
R2C3 can only be <6>
R3C3 can only be <4>
R2C8 can only be <3>
R2C5 can only be <2>
R3C8 can only be <8>
R3C2 can only be <9>
R8C3 can only be <2>
R2C7 can only be <9>
R3C5 can only be <3>
R2C2 can only be <5>
R3C7 can only be <2>
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