500 Sudoku Puzzles: Big Book of 500 Extreme Sudoku Puzzles
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(In stock)
500 Sudoku Puzzles: Big Book of 500 Extreme Sudoku Puzzles, Japanese Abacus for Kids: (Black & White Version). a Step-By-Step Guide to Addition and Subtraction Using the Japanese Abacus (Soroban)., 9781541019843
In stock
500 Sudoku Book is a collecting of 500 Sudoku puzzles in “extreme” difficulty. There are 4 puzzles per page in appropriate size and no symmetry applied. Solutions are provided at the end.