When you're working on a Sudoku puzzle you can throw vocabulary and factual knowledge out the window. Keys to solving Sudoku puzzles are logic and diligence along with these key strategies:
It's harder than it looks! Even with the easiest puzzle, you won't fill in a Sudoku grid in a matter of minutes.
Each puzzle has a unique answer; you can't find multiple ways to solve it.
Start each puzzle by locating obvious, definite answers — those that you can solve simply by looking at what else falls within a particular row, column, and 3-x-3 box.
When you've exhausted the obvious answers, you need to find a systematic way to explore the less obvious (but still definite) answers.
Myriad advanced strategies exist. If you search for killer, advanced, or extreme Sudoku online, you'll find countless websites that contain strategy suggestions for the toughest of puzzles.
