Astraware Sudoku is a handheld Sudoku game utilising touch screen, stylus or 5-way controls depending on device constraints. It also includes a number of features such as pencil marks, a hint system, a puzzle generator, score uploads and different difficulty levels. Devices connected to an online network can download a new puzzle every day. There is also a puzzle solver that assists in solving sudokus in print. On devices that also act as phones the application immediately saves and exits when there is an incoming call.