skip to main content




Daily Sudoku Answer 



Loading

X

Loading

Dec 22 - Super Hard
Puzzle Copyright © Kevin Stone

Share link – www.brainbashers.com/s123639



Reasoning 



R4C1 can only be <4>

R1C3 is the only square in row 1 that can be <6>

R2C5 is the only square in row 2 that can be <2>

R3C8 is the only square in row 3 that can be <2>

R3C9 is the only square in row 3 that can be <3>

R4C4 is the only square in row 4 that can be <2>

R9C3 is the only square in row 9 that can be <3>

R5C6 is the only square in row 5 that can be <3>

R6C1 is the only square in row 6 that can be <3>

R2C3 is the only square in column 3 that can be <9>

Squares R5C2 and R5C3 in row 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <12>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R5C5 - removing <1> from <1468> leaving <468>

Intersection of row 9 with block 9. The values <89> only appears in one or more of squares R9C7, R9C8 and R9C9 of row 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain these values.

R7C7 - removing <8> from <145678> leaving <14567>

R7C8 - removing <8> from <578> leaving <57>

R7C9 - removing <8> from <1678> leaving <167>

Intersection of column 4 with block 5. The value <6> only appears in one or more of squares R4C4, R5C4 and R6C4 of column 4. These squares are the ones that intersect with block 5. Thus, the other (non-intersecting) squares of block 5 cannot contain this value.

R5C5 - removing <6> from <468> leaving <48>

R6C5 - removing <6> from <169> leaving <19>

Intersection of column 9 with block 9. The value <1> only appears in one or more of squares R7C9, R8C9 and R9C9 of column 9. These squares are the ones that intersect with block 9. Thus, the other (non-intersecting) squares of block 9 cannot contain this value.

R7C7 - removing <1> from <14567> leaving <4567>

R8C7 - removing <1> from <14567> leaving <4567>

R9C7 - removing <1> from <14589> leaving <4589>

Intersection of block 2 with row 1. The value <7> only appears in one or more of squares R1C4, R1C5 and R1C6 of block 2. These squares are the ones that intersect with row 1. Thus, the other (non-intersecting) squares of row 1 cannot contain this value.

R1C2 - removing <7> from <157> leaving <15>

R1C7 - removing <7> from <15789> leaving <1589>

R1C8 - removing <7> from <5789> leaving <589>

Squares R9C2<145>, R9C4<45> and R9C6<15> in row 9 form a comprehensive naked triplet. These 3 squares can only contain the 3 possibilities <145>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.

R9C7 - removing <45> from <4589> leaving <89>

R9C8 - removing <5> from <589> leaving <89>

Squares R5C2, R5C3, R7C2 and R7C3 form a Type-4 Unique Rectangle on <12>.

R7C2 - removing <1> from <12457> leaving <2457>

R7C3 - removing <1> from <1248> leaving <248>

Squares R9C7, R9C8, R1C7 and R1C8 form a Type-3 Unique Rectangle on <89>. Upon close inspection, it is clear that:

(R1C7 or R1C8)<15> and R1C2<15> form a naked pair on <15> in row 1. No other squares in the row can contain these possibilities

R1C4 - removing <5> from <57> leaving <7>

R1C6 - removing <5> from <578> leaving <78>

(R1C7 or R1C8)<15>, R1C4<57> and R1C2<15> form a naked triplet on <157> in row 1. No other squares in the row can contain these possibilities

R1C6 - removing <7> from <78> leaving <8>

R6C4 can only be <6>

R4C6 can only be <5>

R3C5 can only be <5>

R9C6 can only be <1>

R5C4 can only be <4>

R6C6 can only be <7>

R5C5 can only be <8>

R9C4 can only be <5>

R5C8 can only be <7>

R4C5 can only be <9>

R5C7 can only be <6>

R7C8 can only be <5>

R6C9 can only be <9>

R6C5 can only be <1>

R4C9 can only be <8>

R1C8 can only be <9>

R9C2 can only be <4>

R9C8 can only be <8>

R2C9 can only be <7>

R8C3 can only be <1>

R9C7 can only be <9>

R8C9 can only be <6>

R5C3 can only be <2>

R8C5 can only be <4>

R7C9 can only be <1>

R5C2 can only be <1>

R7C3 can only be <8>

R7C1 can only be <7>

R3C3 can only be <4>

R8C7 can only be <7>

R7C5 can only be <6>

R8C1 can only be <5>

R7C7 can only be <4>

R1C2 can only be <5>

R3C2 can only be <7>

R7C2 can only be <2>

R2C1 can only be <8>

R1C7 can only be <1>

R3C7 can only be <8>

R2C7 can only be <5>

R3C1 can only be <1>



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