Sudoku Extreme, Volume 4 (Electronic book text)

Sudoku Extreme Volume 4 book contains total of 228 hard puzzles organized at 5 different difficulty levels (1-5) with all of their solutions. The instruction to play both in English and Spanish. This book was designed for more advanced sudoku players. Each individual puzzle has a single unique solution based on logical strategies and no "guessing" or "Trial & Error" are required. Please note that this is an EBook and you should be able to print your puzzles and it is not an interactive game.