Sudoku is a simply easy-to-use game that has become one of the most popular mind skill fitness apps. With its fresh and cool interface, this app offers a wide range of difficulty levels, making it suitable for both sudoku beginners and experts.

Featuring three awesome skill levels, Sudoku provides an intuitive interface and all the necessary functions right at your fingertips. Whether you're interrupted by a phone call, a crying baby, or someone watching over your shoulder (we won't tell, but stay safe!), you can exit the game and your puzzle will be saved exactly as you left it.

Best of all, Sudoku is completely free! It offers three levels of difficulty - easy, medium, and hard. The smooth interface and impressive graphics enhance the overall gaming experience. You can also make pencil marks as notes, take advantage of the auto-save feature, and use the undo and redo options.

Additionally, Sudoku provides hints to help you complete the more challenging puzzles. It also highlights the selected digit and any incorrect entries, making it easier to identify and correct mistakes.

In terms of gameplay, Sudoku is a logic-based number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 sub-grids contains all the digits from 1 to 9. With its user-friendly interface and engaging gameplay, Sudoku is sure to become your favorite brain-training app.