SumSudoku: Killer Sudoku

Conceptis Ltd.

In-app purchases

About this game

Play a crossover variation of Sudoku and Kakuro! SumSudoku, also known as Killer Sudoku, are addictive logic puzzles best described as a cross between Sudoku and Kakuro. Using pure logic and simple add/subtract calculations, these fascinating puzzles offer endless fun and intellectual entertainment to puzzle fans of all skills and ages.

Each puzzle consists of a 9x9 Sudoku grid containing areas surrounded by dark borders. The object is to fill all empty squares so that the numbers 1 to 9 appear exactly once in each row, column and 3x3 box, and the sum of the numbers in each area is equal to the clue in the area's top-left corner. In addition, no number may be used in the same area more than once.

The game includes helpful features such as showing possible sum number combinations in an area and pencilmarks to make temporary placement of numbers in the grid.

To help see the puzzle progress, graphic previews in the puzzle list show the progress of all puzzles in a volume as they are being solved. A Gallery view option provides these previews in a larger format.

For more fun, Conceptis SumSudoku includes a Weekly Bonus section providing an extra free puzzle each week.

PUZZLE FEATURES

• 90 free SumSudoku puzzle samples
• Extra bonus puzzle published free each week
• Multiple difficulty levels from easy to very hard
• Puzzle library continuously updates with new content
• Manually selected, top quality puzzles
• Unique solution for each puzzle
• Hours of intellectual challenge and fun
• Sharpens logic and improves cognitive skills

GAMING FEATURES

• Unlimited check puzzle
• Unlimited hints
• Show conflicts during gameplay
• Unlimited Undo and Redo
• Show possible sum combinations option
• Pencilmarks feature for solving hard puzzles
• Autofill pencilmarks mode
• Highlight Excluded Squares option
• Lock number on keypad option
• Concurrently playing and saving multiple puzzles
• Puzzle library sorting and hiding options
• Graphic previews showing puzzles progress as they are being solved
• Portrait and landscape screen support (tablet only)
• Track puzzle solving times
• Backup & restore puzzle progress to Google Drive

ABOUT

Conceptis SumSudoku have also become popular under other names such as Killer Sudoku, Sumdoku and Sumoku. All puzzles in this app are produced by Conceptis Ltd. - the leading supplier of logic puzzles to printed and electronic gaming media all over the world. On average, more than 20 million Conceptis puzzles are solved each day in newspapers, magazines, books and online as well as on smartphones and tablets across the world.

Ratings and reviews

Good UI, easy to play. Would like to be able to customize background/number colors, but the default isn't bad. I especially like that it shows sum combinations - in addition, it would be nice if crossing out a possible combination also removed the pencil marks for numbers that are now excluded, rather than having to go back and remove them from each square. The long press to place numbers digit-first is also nice, though I wish there was a toggle to make digit-first default. Still good app 👍

This game is great and has just gotten better over time. The few things I was missing in gameplay I either found were already there or got added over time (such as auto filling pencil marks and crossing off combinations). My one remaining suggestion would be to offer different colors to show selected numbers. The yellow on beige combo is super hard on the eyes at times.

Excellent game and interface. One suggestion after playing a long time: excluding sum combinations should be in the undo records. If you exclude a combo due to a number placement, then undo that number, the exclusion is still there. I guess, while doing a chain of undos, you would want to take the user to that combination screen to show that it's being undone too.

What's new

This major update introduces new architecture, features and improvements:

• Puzzle packs are now split into Library, showing free and purchased puzzle packs, and Shop, showing puzzle packs you can buy
• Filtering by difficulty, size, and price
• Improved sorting options
• Previous/next navigation when completing a puzzle
• Wishlist
• Archiving in the Library section
• Automatic restoring purchases when re-installing the app
• Automatic puzzle pack list refreshing in the Shop section