Why waste all this time creating an Excel spreadsheet when you can solve any Sudoku puzzle (note spelling PLEASE) using sudokue.com. Mode 2 will give you the same functionality shown here, Modes 3 and 4 are even more powerful. - try it now.
Well sometimes u hav 2 think.A Sudoku's made of 9 rows columns and mini-grids and 81 cells.R there sum mini-grids where u r sure that a certain number must be in a certain row in the mini-grid, but u dont no what cell its in?Since that number *must* be in that row in the mini-grid, u can eliminate that number in all other cells in that row as a possibility. That helps too.