100 Large Print Hard 6x6 Sudoku Puzzles for Adults: Only One Puzzle Per Page! (Pocket 6

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

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Hello My Sudoku: 4x4, 6x6, 8x8, & 9x9 Puzzle Grids 200 Challenging Fun Brain Teasers and Logic Puzzle Games for Smart Kids (Paperback)

Chain Sudoku Ser.: Chain Sudoku - 200 Normal Puzzles 6x6 Vol. 6 by David Smith (2019, Trade Paperback) for sale online