Extreme Sudoku Puzzles for the Frequent Traveler Over 200 Sudoku Hard Travel

Traveling solo can sometimes get boring, especially if you've been in a moving vehicle for more than a few hours. You can drive that boredom away with the help of mind games like hard Sudoku puzzles. Hard puzzles challenge you to think and when that happens, you forget the ticking of the clock and the places rushing by. Safe travels!