Sudoku is one of the world’s most popular puzzle games, but even though it’s a game played by millions of people all over the world, there is a big difference in skill level between the most successful Sudoku players and average Sudoku players who enjoy the game just as a casual hobby.

In the previous article in this series, we showed how to get started at solving Sudoku puzzles by searching the grid for “low-hanging fruit” and using simple process of elimination skills to identify which numbers need to go in which empty spaces.