Can all Sudoku puzzles be solved without guessing?

Related questions

1. Can a sudoku puzzle be unsolvable?
2. Is there any formula for Sudoku?
3. Is sudoku good for Alzheimer's?
4. Can a Sudoku have 2 solutions?
5. Does Sudoku improve logic?
6. How can I play Sudoku for free?
7. Is every Sudoku solvable?
8. Does Sudoku prevent dementia?
9. Can Sudoku increase IQ?
10. Does Sudoku increase IQ?

Tags

1. #irrelevant
2. #solutions
3. #puzzle
4. #which
5. #solved
6. #solution
7. #multiple
8. #guess
9. #would
10. #whether
11. #guessing
12. #without
13. #possible
14. #improper
15. #could
16. #guesses
17. #every
18. #proper
19. #sudoku