Nov 27 - Super Hard
Puzzle Copyright © Kevin Stone
Share link – www.brainbashers.com
Reasoning
R5C5 can only be <8>
R8C3 can only be <8>
Squares R8C6 and R8C7 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R8C5 - removing <79> from <2479> leaving <24>
Squares R2C3 and R6C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <14>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R4C3 - removing <4> from <245> leaving <25>
R5C3 - removing <1> from <125> leaving <25>
Squares R4C3 and R5C3 in block 4 form a simple naked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R4C1 - removing <5> from <578> leaving <78>
R4C2 - removing <5> from <3457> leaving <347>
R5C1 - removing <5> from <1567> leaving <167>
R5C2 - removing <5> from <579> leaving <79>
Squares R7C5 and R8C6 in block 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.
R7C6 - removing <79> from <15789> leaving <158>
R9C5 - removing <7> from <367> leaving <36>
R9C6 - removing <7> from <3578> leaving <358>
Intersection of row 3 with block 2. The values <16> only appears in one or more of squares R3C4, R3C5 and R3C6 of row 3. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain these values.
R1C4 - removing <1> from <1245> leaving <245>
R1C6 - removing <1> from <159> leaving <59>
R2C4 - removing <1> from <148> leaving <48>
R2C6 - removing <1> from <1378> leaving <378>
Squares R8C4, R8C5, R1C4 and R1C5 form a Type-3 Unique Rectangle on <24>. Upon close inspection, it is clear that:
(R1C4 or R1C5)<59> and R1C6<59> form a naked pair on <59> in block 2. No other squares in the block can contain these possibilities
R3C4 - removing <5> from <1456> leaving <146>
R3C6 - removing <5> from <157> leaving <17>
(R1C4 or R1C5)<59> and R1C6<59> form a naked pair on <59> in row 1. No other squares in the row can contain these possibilities
R1C1 - removing <5> from <15> leaving <1>
(R1C4 or R1C5)<59>, R1C6<59> and R1C1<15> form a naked triplet on <159> in row 1. No other squares in the row can contain these possibilities
R1C9 - removing <1> from <14> leaving <4>
R2C3 can only be <4>
R3C8 can only be <7>
R2C4 can only be <8>
R6C3 can only be <1>
R3C2 can only be <5>
R7C2 can only be <7>
R3C6 can only be <1>
R2C7 can only be <1>
R7C5 can only be <9>
R5C2 can only be <9>
R9C1 can only be <5>
R7C8 can only be <8>
R1C5 can only be <2>
R8C6 can only be <7>
R9C9 can only be <7>
R8C7 can only be <9>
R2C6 can only be <3>
R6C7 can only be <3>
R9C4 can only be <6>
R9C5 can only be <3>
R9C6 can only be <8>
R2C5 can only be <7>
R4C9 can only be <8>
R1C4 can only be <5>
R8C5 can only be <4>
R3C4 can only be <4>
R7C6 can only be <5>
R4C1 can only be <7>
R6C9 can only be <6>
R5C8 can only be <2>
R5C3 can only be <5>
R4C8 can only be <4>
R6C2 can only be <4>
R6C1 can only be <8>
R5C9 can only be <1>
R7C4 can only be <1>
R1C6 can only be <9>
R8C4 can only be <2>
R3C5 can only be <6>
R4C7 can only be <5>
R5C1 can only be <6>
R4C3 can only be <2>
R5C7 can only be <7>
R4C2 can only be <3>
R6C8 can only be <9>
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