Product Sudoku (Mini Sudoku Series #21) Sudoku, Printable puzzles, Online math

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

Sudoku 6x6 - Medium

6x6 Consecutive Sudoku (Mini Sudoku Series #61)

RowColumnBox Difference Sudoku (6x6) — Rätselportal — Logic Masters Deutschland

6x6 Diagonal Sudoku Puzzles (MSSeries #115, #116)

100 Large Print Easy 6x6 Sudoku Puzzles for Adults: Only One Puzzle Per Page! (Pocket 6x9 Size) (Paperback)(Large Print)

Free Printable Sudoku 6x6 Puzzles

Sudoku 6x6: Sudoku for Kids: 6x6 Easy 100 Puzzles Games Book with Solution for Beginners Vol.2 Space Themed, Kids Ages 6-10 (Paperback)

Long-Range Arrows (6x6) — Rätselportal — Logic Masters Deutschland

6x6 Sudoku Puzzles Printable - Sheet 2