Sudoku Puzzle Game

Sudoku is a logic game and helps you improve your mental capacity. The objective of the game is to fill the entire field with the numbers that each number appears only once in each row, column and sub-section.
Sudoku has three different game modes:
6x6 board with 2x3 sub-sections
9x9 board with 3x3 subsections
12x12 board with 3x4 sub-sections
There are four different difficulty levels that are not based on the number of predefined fields. The level generator always tries to specify the minimum number of fields that are necessary to solve the game.