Cool Sudoku Killer Kakuro Hitori Nurikabe is a must-have app for any puzzle lover out there. With this app, you can play Sudoku, Killer Sudoku, Jigsaw Sudoku, Kakuro, Mini Sudoku, Sudoku X, Hitori, and Nurikabe, all in one place. The puzzles are expertly graded and have only one solution, so you can solve them using logical methods without any guesswork required.

The app offers daily competitions for each puzzle type, allowing you to submit your completed entry and view your position on the daily leader board. You can also practice Sudoku puzzles by choosing from graded puzzles that range from Gentle to Diabolical. The app saves your progress as you go, stopping the clock as you exit. All pencil marks are saved when you exit the app or receive a phone call. The display is clear and easy to read, and you can enter pencil marks for all puzzle types.