Conceptis SumSudoku – Using pure logic

[Game] Conceptis SumSudoku

Conceptis SumSudoku  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 9×9 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 3×3 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.


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


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


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.

Conceptis SumSudoku user reviews :

Conceptis makes the best apps for Sudoku games! They are fairly priced and feature rich. I have tried a ton and this one just works the best. .– UPDATE They have come up with even better features for tracking your progress. You can now track which sets work and don’t work in each set of cages sums now. I had been thinking of asking for this feature and they beat me to it. BEST SUDOKU APP BY FAR!

Good Killer Sudoku App. The missing 5th star could be gained if they included a way to ‘cross out’ the possibilities as you eliminate them. Over all fun and free, and the puzzles I’ve done so far are well designed. Edit: Update includes the ruling out of possible cages and earned the 5th star. To the Devs: Any plans to introduce ‘packs’ of levels? For example including an Easy, Medium, hard and killer? etc for a bundled price?
  • Conceptis Ltd.
  • We found most of our users enjoy solving puzzles with the same level according to the skill they’ve reached. This is why we usually don’t mix different levels in the same packs.

I think the game would be improved if pencilled-in options were sensitive to conflicts. Even with the conflict option switched on they are not. Otherwise, very enjoyable, and the absence of ads during play is extremely welcome. In some other killer sudoku offerings, the ads are frequent, intrusive and unethical (e.g. promoting gambling).

Quite good and challenging on v.hard level, would like to be able to select multiple cells to make changes rather than poke each cell individually .

Just the right amount of automatic changes occur. You can still make some mistakes and have to discover them yourself, but it cleans up your notes as you use numbers. It even let’s you back up and restore changes. Very reliable – I haven’t encountered any glitches.

So far, I am enjoying these Sumsudoko puzzles. I am able to check my answer placements, correct, pause, and finished each puzzle.

Great intuitive design. Reasonable prices for additional games. No annoying ads. I enjoy all the conceptis games I’ve downloaded

Love the non-standard sudokos! And this one is one of the best interfaces I have found.

Love this! Great Killer puzzles. Needs a notes function. Pure logic puzzles.

Didn’t try the first two levels, but am enjoying the harder one. Enough of a challenge.

I really like doing the SumSudku. It engages more of my brain than a standard Suduku without being too taxing.

I really like this app. Normally, I don’t even have to use pencil marks until Expert on normal sudoku; but, this game is so challenging I have to use pencil marks on beginner<3. They added the feature where you can cross out possible cage groups in omega(looks like a 3) and I love it! I’ve played numerous regular sudoku apps and sum sudoku apps. The omega button plus all the other ways to select and highlight make this THE BEST SUM SUDOKU I’ve ever played.

I have always loved Sumdoku puzzles and this is a great app for it. It has every feature you need. I highly recommend!

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