Sudoku Daily

Features: * 60,000 constant questions ensure your accompany * 4 different levels for your choice * New challenge updates everyday * Simple interface operation settings for your convenience * Error reminding to save your time * Highlighted numbers for clear mind Auxiliary functions: * Cancel, reverse pencil records * Erase, erase pencil records * Pencil, make draft with pencil * Reminder, provide one chance to assist you filling one number in each game