Book 4

Sudoku Medium to Hard

by This Design

Published 22 February 2021

Book 7

Hard Sudoku Book

by This Design

Published 6 March 2021

Book 8


Book 9

Hard Sudoku Puzzles

by This Design

Published 6 March 2021

Book 13


Book 19

Medium Sudoku Book

by This Design

Published 20 March 2021

Book 20