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Would be great, if anybody would help me with the next step

Hi Sebinator0815. It appears that you've made some mistakes along the way. You have six false numbers on your grid. The correct pencilmarks after basic techniques:

Code: Select all

.---------------.--------------.---------------.
| 6    7    4   | 39  138  189 | 5   138   2   |
| 189  189  5   | 2   36   4   | 19  367   37  |
| 129  129  3   | 5   168  7   | 4   1689  189 |
:---------------+--------------+---------------:
| 5    6    189 | 39  2    189 | 7   139   4   |
| 179  3    179 | 6   4    5   | 8   2     19  |
| 189  4    2   | 7   138  189 | 6   5     139 |
:---------------+--------------+---------------:
| 3    19   6   | 4   5    2   | 19  78    78  |
| 278  28   78  | 1   9    6   | 3   4     5   |
| 4    5    19  | 8   7    3   | 2   19    6   |
'---------------'--------------'---------------'


For the rest you need a bit more advanced techniques. Are you familiar with things like Empty Rectangles, X-Wings, XY-Wings, Remote Pairs? If not, this might be a bit tough puzzle for you. We can help, though, but first you need to correct your mistakes.

I'm not sure if this is helpful but this is a printable Empty 9x9 sudoku sheet with the pencilmarks in faint shading in the background of each cell. This may help in reducing these mistakes



tarek