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

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

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

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File:4x4 shapes sudoku puzzle.pdf - Wikimedia Commons

Sudoku Challenge

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