Cross out digits from the board in the way, that the remaining digits form groups, in which the sum of digits must respond to the numbers given outside the diagram.
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Online solving:
When you click on any field of board, you will see the menu with following options to choose:
„*” – symbol of kept digit,
„X” - symbol of crossed out digit.
When you choose a wrong digit, “Wrong solution” note will appear.
Moreover, when you click on digits presented outside the diagram, you will “unmark” them (it means that particular group of digits is completed).
