Professor Otter

Sudoku

Fill in the empty squares so every row, every column and every box has each number once. No guessing needed: each puzzle can be solved one step at a time. Start small with 4×4, then work up to the classic 9×9.

20 puzzles

Easy 4×4

Easy Sudoku 1
A first sudoku. Puzzle 1 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 2
A quick warm-up. Puzzle 2 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 3
Small and friendly. Puzzle 3 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 4
A perfect starter. Puzzle 4 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 5
A first sudoku. Puzzle 5 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 6
A quick warm-up. Puzzle 6 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 7
Small and friendly. Puzzle 7 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 8
A perfect starter. Puzzle 8 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 9
A first sudoku. Puzzle 9 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 10
A quick warm-up. Puzzle 10 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 11
Small and friendly. Puzzle 11 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 12
A perfect starter. Puzzle 12 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 13
A first sudoku. Puzzle 13 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 14
A quick warm-up. Puzzle 14 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 15
Small and friendly. Puzzle 15 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 16
A perfect starter. Puzzle 16 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 17
A first sudoku. Puzzle 17 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 18
A quick warm-up. Puzzle 18 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 19
Small and friendly. Puzzle 19 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint
Easy Sudoku 20
A perfect starter. Puzzle 20 gives you 8 numbers; fill the other 8 of this 4×4 grid.
4×4 · 8 cluesPrint