Suitable for all players from beginners through experts with six levels of difficulty, Astraware Sudoku is packed with features. Astraware Sudoku offers a range of different options to help players solve puzzles including manual or automatic pencilmarks in a choice of styles; a smart hints system; and the brand new hold and highlight system which can display an overlay for a specific number or pencilmark helping players to see where to look and what to look for.