Help Dakota Jane solve some brain twisters! Sudoku puzzles come in 4 difficulty levels - easy, medium, hard and expert Sudoku! Perfect for Sudoku beginners and advanced players! Pencil Mode - Turn on/ off pencil mode as you like. Highlight Duplicates - to avoid repeating numbers in a row, column and block. Intelligent Hints - guide you through the numbers when you get stuck Themes - Choose the theme that makes it easier for your eyes.