| This is another interesting sudoku step. To find a solution for this step, you will need all your sudoku knowledge and experience. Let’s look at the bottom left box of the sudoku game (where GHI cross JKL). We can’t put a 6s in column L because there’s already a 6 in cell CL of the same column. We can’t put 6s in column K because we know with certainty that there must be a 6 in the box above us in column K.
How do we know there must be a 6 in column K of the above box (where DEF cross JKL)? We need to add some sophistication to our logic to answer. Column J of this box is already taken with the numbers 3, 4, and 8. We know we can’t put a 6 in column L of this box because there’s a 6 in cell CL. We, therefore, know with certainty that we must have a 6 in column K of this box. Although we don’t know whether the number 6 is in cell DK, EK, or FK, for the purpose of finding where the 6 is in the below box, it doesn’t matter.
So now we are left with two options: cell GJ and HJ.
Let’s look at the bottom right box (where GHI cross PQR). We can’t put a 6 in cell IQ because there’s already a 6 in cell IO. Hence, we know with certainty that the number 6 must be either in cell GQ or GR because there are no other available cells. Let’s go back and look at the bottom left box (where GHI cross JKL). This sudoku logic means that we can’t put a 6 in cell GJ because there’s already a 6 in this row (in either GQ or GR). The inevitable conclusion for this sudoku step is cell HJ must have a 6 in it. | 
