Aug 04 - Super Hard
Puzzle Copyright © Kevin Stone
Share link – www.brainbashers.com
Reasoning
R3C5 is the only square in row 3 that can be <6>
R9C5 can only be <5>
R9C3 can only be <6>
R9C7 can only be <9>
R5C5 is the only square in row 5 that can be <1>
R5C3 is the only square in row 5 that can be <9>
R2C2 is the only square in row 2 that can be <9>
R6C5 is the only square in row 6 that can be <9>
R6C4 is the only square in row 6 that can be <2>
R6C2 is the only square in row 6 that can be <8>
R4C2 can only be <5>
R5C1 can only be <6>
R7C8 is the only square in row 7 that can be <6>
R8C3 is the only square in row 8 that can be <2>
R7C5 is the only square in row 7 that can be <2>
R3C2 is the only square in column 2 that can be <4>
Squares R8C4 and R8C6 in row 8 form a simple naked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.
R8C2 - removing <7> from <17> leaving <1>
R7C2 can only be <7>
R7C7 is the only square in row 7 that can be <1>
R7C9 is the only square in row 7 that can be <4>
Intersection of block 2 with row 2. The value <5> only appears in one or more of squares R2C4, R2C5 and R2C6 of block 2. These squares are the ones that intersect with row 2. Thus, the other (non-intersecting) squares of row 2 cannot contain this value.
R2C3 - removing <5> from <1578> leaving <178>
R2C7 - removing <5> from <4578> leaving <478>
R2C8 - removing <5> from <1457> leaving <147>
Squares R7C1, R7C3, R3C1 and R3C3 form a Type-1 Unique Rectangle on <58>.
R3C3 - removing <58> from <1578> leaving <17>
Squares R8C4, R8C6, R4C4 and R4C6 form a Type-4 Unique Rectangle on <67>.
R4C4 - removing <7> from <678> leaving <68>
R4C6 - removing <7> from <367> leaving <36>
Squares R4C4 (XY), R8C4 (XZ) and R4C5 (YZ) form an XY-Wing pattern on <7>. All squares that are buddies of both the XZ and YZ squares cannot be <7>.
R5C4 - removing <7> from <57> leaving <5>
R5C9 can only be <3>
R6C6 can only be <4>
R3C9 can only be <5>
R4C8 can only be <7>
R6C8 can only be <5>
R5C6 can only be <7>
R8C8 can only be <3>
R8C7 can only be <5>
R3C1 can only be <8>
R4C5 can only be <8>
R3C8 can only be <1>
R5C7 can only be <4>
R2C6 can only be <5>
R8C6 can only be <6>
R8C4 can only be <7>
R4C6 can only be <3>
R7C1 can only be <5>
R3C3 can only be <7>
R2C8 can only be <4>
R4C4 can only be <6>
R1C5 can only be <7>
R7C3 can only be <8>
R2C4 can only be <8>
R1C3 can only be <5>
R1C7 can only be <8>
R2C7 can only be <7>
R2C3 can only be <1>
R3C7 can only be <3>
Today's Sudoku Puzzles
All daily items change at midnight GMT – set your local time zone.
Note: BrainBashers has a Dark Mode setting.