Killer Sudoku is a popular variation on classic sudoku puzzles. This app takes the traditional pen-and-paper game to the next level with its intuitive interface and helpful features.

To solve a killer sudoku puzzle, you must fill the board with numbers that obey traditional sudoku rules and make each outlined region sum to a specific value. The app provides all the necessary information to solve the puzzle, making it a great tool for both beginners and experienced players.

One of the standout features of this app is the note entry system. It offers a dedicated note keypad and the ability to select multiple squares, making note-taking fast and efficient. You can even create combination lists that float above the puzzle, allowing for easy rearrangement on the screen.

The app also includes a quick sum button, a quick combination list button, and a built-in mini calculator, making it even easier to solve complex puzzles.

With a variety of customization options, including two color schemes and the ability to highlight mistakes, this app provides a seamless and enjoyable killer sudoku experience.

The app comes with ten free killer sudoku puzzles for testing, and for those who want more, there are over 3,000 puzzles available for purchase. So whether you're a casual player or a dedicated sudoku enthusiast, Killer Sudoku is a must-have app.