World's Hardest 4x4 Micro Sudoku : r/sudoku

Sudoku 4x4 Printable (Great for Kids!)

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

4x4 Sudoku 12

4x4 Sudoku for kids worksheet

1,000 Sudoku: 4x4, 6x6, 8x8, & 9x9 Graphic by SKLM · Creative Fabrica

Wisewoodz Junior Sudoku Whizz made from wood 4x4 – Eco-friendly Sudoku Game – wisewoodz

Printable PDF Easy Sudoku for Kids 4x4 400 Children Puzzles - Portugal

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

The Big Book of Kindergarten Sudoku : 4x4 Sudoku and Wordoku Puzzles for Kids by J. Green (2017, Trade Paperback) for sale online

More Kindergarten Sudoku: 4x4 Classic Sudoku Puzzles for Kids