Step-by-Step Solution
for Saturday 21st September Tricky
Before
Step
After
For box 4, candidates for 4 are all in row 6, so you can remove candidates from other blocks.
Candidates for 7 in boxes 1 and 3 force the candidates in box 2 to be in the remaining line.
Candidates for 8 in boxes 1 and 3 force the candidates in box 2 to be in the remaining line.
Candidates for 8 in boxes 4 and 6 force the candidates in box 5 to be in the remaining line.
For guided hints and great solving assistance like automatic pencilmarks, try Astraware Sudoku Of The Day on your phone or tablet!