Sudoku Wear - Sudoku 4x4::Appstore for Android

Play Sudoku Online for Free, 4x4 9x9 & 16x16 Sudoku

Sudoku 4 x 4 Worksheet - Sudoku for Kids (Teacher-Made)

Sudoku Primer 130 - 4x4 sudoku for kids - sudoku variant

Rule and Tutorial of Sudoku – CalcBlocks – Sudoku like Calculation Puzzles.

Making Learning Fun

200 Sudoku Puzzles for Kids 4x4 VOL 9 Graphic by BAM DESIGNS · Creative Fabrica

4x4 sudoku - Easy Worksheets,Easy Sudoku Puzzles for Kids

Online free sudoku puzzles

I hired a developer to create a sudoku generator for me. It generates 4x4, 6x6 and 9x9 with the difficulties easy, medium, hard, very hard. This is from a 6x6 very hard

Krychle Sudoku 4x4: 120 3D Sudoku Cubes, 3 grids in 1 by Sudoku Magazine, Paperback