9x9 Sudokus bore you? Find out if you are ready for the ultimate challenge: 16x16 Sudokus. This is for highly advanced Sudoku Players only. - Play 4x4, 9x9 and 16x16 Sudokus - and unlock the ultimate challenge - Touch-Screen, Trackball and Keyboard support - Pencil in functionality - Resume games where you left off - Ease to understand tutorial - Optimized for phones and tablets - Solve the build in challenge of 30 Sudokus, and play an unlimited number of Sudokus in Free Play mode (Sudoku generator) - Portrait or landscape mode (just turn your device) Not recommended for beginners. Free, with ads. With downloading the game, you explicitly agree to the Terms of Usage set forth at: http://www.apptebo.com/game_tou.html