There are four different levels of difficulty per game mode, not based on the number of predefined fields, but on the solution strategies needed to solve the sudoku. The level generator always tries to set the minimum number of fields needed to solve the game.
Exit Sudoku, and the puzzle is saved exactly as you see it!

- 6x6 field with 2x3 subsections
- 9x9 playing field with 3x3 subsections
- 12x12 playing field with 3x4 subsections