What is the fastest way to solve suduko without the solution at hand?

Question

It is spelt many different ways.I dont care how it is spelt.Just looking for a fast way to solve it on a difficult level under 9 minutes

Answer 1

Its SUDOKU, not suduko.

Answer 2

do the puzzle one square at a time, constantly guessing and checking while looking up and down the rows and columns to see if the number fits.

Good luck!