[Android] $0: Classic Sudoku PRO (No Ads) (Was $4.19) @ Google Play

Grab it if you missed is before :)

Sudoku is a logic-based, combinatorial number-placement puzzle game. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid contains all of the digits from 1 to 9.
The sudoku logic puzzle is completely free and no advertisement is used.
This innovative sudoku free game has several best features like game time and history.
The game has two game play style- Classic and Unlimited. Classic mode contains 1000 unique puzzle of four difficulty levels. Unlimited game style support three different game modes:
1. a 6x6 game field with 2x3 subsections
2. a 9x9 game field with 3x3 subsections
3. a 12x12 game field with 3x4 subsections

For each game mode there are four different difficulty levels, that are not measured by the number of set values but rather by the solving strategies needed to solve the game.