Sudoku is the most popular logic-based numbers game. The aim of the game is to place 1 to 9 into each grid cell so that each number can only appear once in each row, each column and each mini-grid. This is a easy-to-use sudoku game, with sample interface, very acceptable difficult levels, suitable for sudoku beginner to sudoku expert. Features: 1. Several difficult mode 2. Pencil marks 3. Error checks 4. Auto-save More FREE puzzles will coming soon!