Feb 10 - Hard
Puzzle Copyright © Kevin Stone
Share link:
Reasoning
R9C2 can only be <2>
R6C2 can only be <4>
R1C4 is the only square in row 1 that can be <4>
R2C3 is the only square in row 2 that can be <4>
R5C7 is the only square in row 5 that can be <4>
R8C8 is the only square in row 8 that can be <4>
R9C6 is the only square in row 9 that can be <4>
R9C5 is the only square in row 9 that can be <1>
R2C6 is the only square in row 2 that can be <1>
R6C4 is the only square in row 6 that can be <1>
R5C3 is the only square in row 5 that can be <1>
R5C1 is the only square in row 5 that can be <5>
R9C1 can only be <7>
R8C9 is the only square in row 8 that can be <1>
R3C6 is the only square in column 6 that can be <6>
R6C7 is the only square in column 7 that can be <7>
R6C6 can only be <2>
R6C9 can only be <8>
R5C6 can only be <3>
R5C4 can only be <8>
R5C9 can only be <2>
R7C6 can only be <9>
R1C9 can only be <3>
R4C8 can only be <3>
R4C6 can only be <7>
R4C4 can only be <9>
R2C2 is the only square in column 2 that can be <3>
Squares R3C3 and R3C7 in row 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R3C4 - removing <2> from <237> leaving <37>
R3C5 - removing <29> from <2379> leaving <37>
Squares R7C3 and R9C3 in column 3 form a simple naked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R8C3 - removing <8> from <689> leaving <69>
Squares R1C5 and R2C5 in column 5 form a simple naked pair. These 2 squares both contain the 2 possibilities <29>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.
R7C5 - removing <2> from <238> leaving <38>
R8C5 - removing <2> from <278> leaving <78>
Intersection of column 8 with block 3. The value <2> only appears in one or more of squares R1C8, R2C8 and R3C8 of column 8. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.
R1C7 - removing <2> from <2569> leaving <569>
R2C7 - removing <2> from <2689> leaving <689>
R3C7 - removing <2> from <29> leaving <9>
R3C3 can only be <2>
R4C3 can only be <6>
R2C1 can only be <6>
R4C1 can only be <2>
R8C3 can only be <9>
R8C2 can only be <6>
R2C7 can only be <8>
R1C2 can only be <9>
R2C8 can only be <2>
R8C7 can only be <2>
R2C5 can only be <9>
R1C8 can only be <5>
R8C4 can only be <7>
R7C7 can only be <5>
R1C5 can only be <2>
R1C7 can only be <6>
R9C8 can only be <8>
R7C3 can only be <8>
R8C5 can only be <8>
R3C4 can only be <3>
R7C5 can only be <3>
R9C3 can only be <5>
R3C5 can only be <7>
R7C4 can only be <2>
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