1. Know the goal
Every row, every column and every box must contain each number once. You never need to calculate – sudoku is a logic game.
2. Start where it’s fullest
Look for a row, column or box that already has many numbers. Fewer gaps mean fewer options.
3. Find the missing number
If a row already has eight numbers, the missing one is easy to spot. Write it in.
4. Follow one number
Pick a number, for example 5. See where it already stands and which squares it blocks. Often only one free square is left in a box.
5. Use notes
Not sure? Write small candidate numbers in a square. When a number is placed nearby, cross it out – the answer appears by itself.
Easy
5
7
2
1
9
4
6
3
8
5
1
3
8
2
6
6
1
9
2
8
3
3
4
5
7
7
3
6
7
1
4
2
7
8
9
3
3
5
7
8