Apr 03 - Very Hard
Puzzle Copyright © Kevin Stone
Share link – www.brainbashers.com
Reasoning
R4C9 can only be <4>
R2C5 is the only square in row 2 that can be <7>
R4C2 is the only square in row 4 that can be <7>
R4C1 is the only square in row 4 that can be <1>
R7C4 is the only square in row 7 that can be <4>
R7C9 is the only square in row 7 that can be <7>
R6C2 is the only square in column 2 that can be <2>
R6C9 can only be <6>
R2C9 can only be <8>
R5C9 can only be <2>
R9C9 can only be <1>
R5C7 is the only square in row 5 that can be <8>
R5C3 is the only square in row 5 that can be <3>
R2C2 is the only square in row 2 that can be <3>
R3C5 is the only square in row 3 that can be <3>
R5C1 is the only square in row 5 that can be <6>
R5C5 is the only square in row 5 that can be <5>
R6C8 is the only square in row 6 that can be <3>
R8C7 is the only square in row 8 that can be <3>
R5C4 is the only square in column 4 that can be <1>
R5C6 can only be <9>
R1C7 is the only square in column 7 that can be <2>
Intersection of column 6 with block 2. The value <8> only appears in one or more of squares R1C6, R2C6 and R3C6 of column 6. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.
R1C5 - removing <8> from <189> leaving <19>
Squares R2C3<569>, R6C3<59> and R9C3<569> in column 3 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <569>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R3C3 - removing <56> from <1456> leaving <14>
R8C3 - removing <69> from <1469> leaving <14>
Squares R9C2<569>, R9C3<569> and R9C4<69> in row 9 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <569>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R9C5 - removing <9> from <289> leaving <28>
R9C8 - removing <69> from <2689> leaving <28>
Squares R2C3 and R9C3 in column 3 and R2C4 and R9C4 in column 4 form a Simple X-Wing pattern on possibility <6>. All other instances of this possibility in rows 2 and 9 can be removed.
R9C2 - removing <6> from <569> leaving <59>
R2C7 - removing <6> from <56> leaving <5>
R4C7 can only be <9>
R4C8 can only be <5>
R7C7 can only be <6>
R8C6 is the only square in row 8 that can be <6>
R9C4 can only be <9>
R9C2 can only be <5>
R2C4 can only be <6>
R2C3 can only be <9>
R9C3 can only be <6>
R6C3 can only be <5>
R6C1 can only be <9>
R8C1 can only be <4>
R8C3 can only be <1>
R1C1 can only be <8>
R8C5 can only be <2>
R3C3 can only be <4>
R7C2 can only be <9>
R8C8 can only be <9>
R9C5 can only be <8>
R7C8 can only be <8>
R9C8 can only be <2>
R7C5 can only be <1>
R1C6 can only be <1>
R3C1 can only be <5>
R1C2 can only be <6>
R1C5 can only be <9>
R3C6 can only be <8>
R3C8 can only be <6>
R3C2 can only be <1>
R1C8 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