SumSudoku: Killer Sudoku

SumSudoku is a puzzle game that challenges players to fill a 9x9 grid with numbers 1 to 9, making sure that each row, column, and 3x3 box contains all numbers exactly once. The game also includes areas surrounded by dark borders, where the sum of the numbers in each area must equal the clue in the top-left corner. Additionally, no number can be used more than once in the same area. This game is designed to sharpen logic and improve cognitive skills while providing hours of intellectual challenge and fun.

The game offers 120 free puzzle samples, with new content continuously being added to the puzzle library. Players can choose from multiple difficulty levels, ranging from easy to very hard, and can track their solving times. The puzzles are manually selected and of top quality, ensuring a unique solution for each one. To help players progress, the game includes features such as showing possible sum number combinations in an area and pencilmarks for temporary placement of numbers. There is also an option to highlight excluded squares and lock numbers on the keypad.

SumSudoku also offers a Weekly Bonus section, providing an extra free puzzle each week for more fun. The game is ad-free and offers unlimited check puzzle, hints, and undo/redo options. Players can also save and play multiple puzzles at once, and the game supports both portrait and landscape modes on tablets. For convenience, there is a backup and restore feature for puzzle progress using Google Drive.

The game is produced by Conceptis Ltd., a leading supplier of logic puzzles to printed and electronic media worldwide. These types of puzzles are also known by other names such as Killer Sudoku, Sumdoku, and Sumoku. With over 20 million Conceptis puzzles being solved each day, SumSudoku offers a high-quality and challenging gaming experience for players of all levels.