You can remove 4'5'8 from the far right cells in the middle box. With the 3 and 6 solved. You know that those four cells (2, 4, 5, and 8) only contain that, so the other ones (the 3 cells in the right) cannot.
Also, the top line from the bottom group.. the 4,5,8 trio is there too. That will clear out those numbers from any cells that may also have 4,5,8 on that line.
Bottom row 2&7 are in there twice. Remove 2&7 from all other cells in this row. Now in bottom middle 3x3 you have twice 5&8. Therefore bottom left of bottom middle 3x3 is 9.
And off you go...
You can remove 4'5'8 from the far right cells in the middle box. With the 3 and 6 solved. You know that those four cells (2, 4, 5, and 8) only contain that, so the other ones (the 3 cells in the right) cannot.
Also, the top line from the bottom group.. the 4,5,8 trio is there too. That will clear out those numbers from any cells that may also have 4,5,8 on that line.
Thank you so much! I don't quite understand this so I'm going to have a look in the morning and try wrap my head around it
It's cause those are the only locations in that row that 179 are in, so the 458 can't be there.
Bottom row 2&7 are in there twice. Remove 2&7 from all other cells in this row. Now in bottom middle 3x3 you have twice 5&8. Therefore bottom left of bottom middle 3x3 is 9. And off you go...
Thank you for your help!