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Crossdoku is a great Math Crossword Sudoku Puzzle to practice logic, math and deductive reasoning skills at the same time for the whole family adults and kids. It has many different Sudoku number junctions puzzles. It is a challenging Math Cross Numbers Puzzle to improve memory, concentration and logical thinking skills. Google Play Store: https://play.google.com/store/apps/details?id=air.Ganaysa.SudokuOctangles Apple App Store: https://itunes.apple.com/app/id1480851707 Amazon Appstore: https:/// It includes 2 separate games: - Sudoku Addition: the number between the four adjacent circles is the result of their sum. - Sudoku Multiplication: the number between the four adjacent circles is the result of their multiplication. How to play: - Fill in the empty circles (octagons) so that the number between the four adjacent circles is the result of their sum or multiplication. - But be careful a number can't be used more than once in any column or row like in Sudoku. - To fill the empty circle: drag the number to it or touch that circle. - To clear the non-empty circle: touch it again. The game has 7 different board sizes: 3X3, 4X4, 5X5, 6X6, 7X7, 8X8 and 9X9. Each size has many different puzzles. You have 60 minutes to solve each puzzle. You can save your progress to resume it later. Play, enjoy and have fun !