Designed for phones and tablets, All Star Sudoku is feature rich and easy to use thanks to an intuitive user interface with a zero learning curve. New users can install the app and begin using it immediately. Features Include: Unlimited undo and redo. Readily accessible Undo and Redo buttons located beneath the grid make it a snap to branch off on an experimental solution path and to effortlessly return, step by step, if the path leads to a dead-end. Save and Restore Current State. An alte