SUDOKU Brain games puzzle book hard to extreme: 300 Challenge sudoku puzzles & Solutions

Sudoku is one of the most popular puzzle games of all time. As a logic puzzle, Sudoku is also an excellent brain game. As long as you play Sudoku daily, you will soon start to see improvements in your concentration and logical thinking process when you are solving a puzzle. Because you keep your brain active, which mean reduces the chances of developing Alzheimer.

• Font size 16pt - Standard for eye sight.
• 300 Sudoku - enough to played before get bored and lost it somewhere.
• Hard to Extreme - Challenge and Tough for player
• Including all Solution - just in case, you cannot solve?