Puzzle filtering, sorting and archiving options.Concurrently playing and saving multiple puzzles.

Pencilmarks feature for solving hard puzzles.Sharpens logic and improves cognitive skills.Hours of intellectual challenge and fun.Puzzle library continuously updates with new content.

Multiple difficulty levels from easy to very hard.Extra bonus puzzle published free each week.A Gallery view option provides these previews in a larger format.įor more fun, Conceptis SumSudoku includes a Weekly Bonus section providing an extra free puzzle each week. 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. 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.

In addition, no number may be used in the same area more than once. 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. 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.Įach puzzle consists of a 9x9 Sudoku grid containing areas surrounded by dark borders. 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.

Killer sudoku number combinations