If the hard to extreme Sudoku puzzles will challenge you too much, then think of the word search puzzles as your break.
The brain exercises help to establish your interest in learning regardless of place and time.
It's important to break away from routine every once in a while.
But it's more important to stimulate your brain while you're at it, too.
Hard to extreme sudoku puzzles for adults, paperback/Senor Sudoku
