Do you think you're a Sudoku expert? 16x16 Sudoku Challenge HD is the ultimate test for advanced Sudoku players. It offers a variety of game modes, including 4x4, 9x9, and 16x16 Sudokus, with the option to unlock the ultimate challenge. The game is optimized for phones and tablets, and supports touch-screen, trackball, and keyboard functionality.

One of the best features of this game is the ability to pencil in numbers, making it easier to keep track of possibilities and avoid mistakes. You can also resume games where you left off, which is particularly handy for longer games. The tutorial is easy to understand, making it accessible to players of all levels.