Hi, I have for a long time search for a simple tool:
1. Where I can put in my own start numbers (from newspaper etc.)
2. That eliminates not valid options (row, column, sector)
3. Where I can delete more numbers myself (out of techniques: twins ...)
At last I found one at www.noitavo.com. This has helped me speed up and solve more sudoku's each day. I feel I do the same thinking, but I have got "a virtual secretary" to do the routine paperwork.
Have anyone seen other tools like this ?
www.noitavo.com