Sudoku (5-6 Full Set of 2 Books)

Author: (Japan) NIDOLI
Publisher:
Publish Date: 2006-01-01
Features: This book is divided into three difficulty levels—easy, medium, and hard—based on the solving difficulty of Sudoku puzzles. Next to the difficulty level indicator for each game, there is a small pencil. The number of sweat droplets next to the pencil increases with the game's difficulty. Even if the number of sweat droplets is the same, the difficulty coefficient will be adjusted accordingly due to the different levels the game belongs to. As for the puzzles that are fully covered in sweat droplets, solving them might make you break into a sweat!