hbar, 11 months ago I start with 1s, look in the row blocks to see if I can fill any, then the column blocks. Then move on the 2s, 3s... If a block or row or column is mostly filled in I see if I can get any of the rest to close it out.
I start with 1s, look in the row blocks to see if I can fill any, then the column blocks. Then move on the 2s, 3s... If a block or row or column is mostly filled in I see if I can get any of the rest to close it out.