Mark Irwin

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Mark Irwin Puzzle Maker, Programer, Promt Jockey

Alright, the second book in the Mind Sharpeners series is now live. My pen name is Jackson Trade.Thank you for your atte...
04/17/2026

Alright, the second book in the Mind Sharpeners series is now live. My pen name is Jackson Trade.
Thank you for your attention, this matter.

Think You Can Handle It? Mind Sharpeners Sudoku: Break Me Edition isn't for the faint of heart. With 324 expert-level puzzles across three grid sizes, this is the ultimate mental workout for serious Sudoku solvers. What's Inside: More Than Just a Puzzle Book Most Sudoku books sit on a coffee...

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