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NOOK User Guide Games 152
Diculty Levels
All Sudoku puzzles have one solution that can be obtained by logic, without guessing. But they
dier in diculty based on the number of givens and the diculty of the logic required to solve the
puzzles.
When you start a game, you choose a diculty level: Easy, Medium, Hard, or Extreme.
Starting and Resuming Games
If no game is in progress when you start Sudoku, you start a new game. Tap the diculty level
(Easy, Medium, Hard, or Extreme) to begin the game.
If a game is in progress when you exit Sudoku by tapping the Back button or Home button, the in-
progress game is saved. When you play Sudoku again, the saved game resumes.
To abandon a game and start a new one, tap the Back button and then choose a diculty level for
the new game.
What You Can Enter in a Square
You can enter these numbers in each square:
• Values: Values are what you want to enter to solve the puzzle. If you have a 3x3 square
that already contains the numbers 1-9, except for 7, you would enter the value 7. Values are
indicated in a font that looks like it was written by hand.
• Notes: Notes are your notes about possible values. They appear as smaller, hand-written
numbers.