Sudoku Savant has something for everyone with four difficulty levels including truly diabolical expert puzzles that encompass multiple expert patterns like swordfish, xy-wing, and more. Play the game all on your own, or choose to set the pencil marks initially, update the marks after each solution entry, or even fill in the single marks automatically! Innovative hint system helps users both learn and play the game with hints that explain the technique that the hint is showing. The game includes a complete set of features including multi-level undo, mark filtering, statistics and more.