Sudoku Hero Sudoku Hero is the #1 Sudoku game for Android phones and tablets, and the best way to learn and improve your skills in this classic puzzle game. The “Hint” button can teach you the techniques you need to make progress in this challenging brain game. Features: • The world’s most advanced Sudoku learning tool • The hints not only give you the answer but explain why • Five perfectly balanced difficulty levels • Unlimited Undo/Redo • Auto-Fill Notes Option • Auto-Clear Notes Option • Auto Error-Checking Option