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@dccmath In both control versions, click/tap the sum to select a cell. In regular controls, tapping fills in the cell with the selected digit. In advanced, tapping lets you toggle one or more numbers in the cell. Right-click/press does what tapping does in regular controls.
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@dccmath I admit that advanced controls aren't immediate to use, but after using them for a while I think it's the most natural way to play. They're just, well, advanced and take a moment to get used to. :-)