Solving sudoku puzzles

Overview

Sudoku puzzles are interesting, because they can all be solved logically without guessing. However, you need patience, because Sudoku rewards patient people. So just when you think a puzzle is impossible to solve without guessing, think again. You might just need to take a break for a bit and come back to it later. This can also help if you're frustrated with the puzzle. That being said, here are some rules to Sudoku:

Rows

Rows go from left to right. Each row must have the numbers 1 to 9 without duplicates.

Columns

Columns go up and down. Each column must have the numbers 1 to 9 without duplicates.

3x3 blocks

There are 9 of these blocks. Each 3x3 block must have the numbers 1 to 9 without duplicates.