What is the main rule of Sudoku?

Each row, column, and box must contain the numbers 1-9 without repeating any number.

Explain what 'cross-hatching' means in Sudoku.

Cross-hatching is the process of eliminating possibilities for a square by looking at the numbers in the same row, column, and box.

To understand the rules and practice simple techniques before moving to harder puzzles.

Grade Adult · Math · 30 min

I can explain how to solve Sudoku puzzles.

Howcast · 2:57

How to Solve a Sudoku Game

4 key concepts

1
Each row, column, and box in Sudoku must contain the numbers 1 through 9.
2
In Sudoku, no row, column, or box may repeat a number.
3
Use cross hatching to figure out where a number fits by eliminating possibilities.
4
If a square already has a number in the same box, column, or row, you can eliminate that number as a possibility for the empty square.

4 questions · Multiple choice & Short answer

Quick comprehension check

“In your own words, explain how to solve a Sudoku puzzle.”

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