How to Solve
Initially activate the "Auto" option for converting single digit pencil marks into regular entries (only for initial setting, not changing the current mode).
Automatically check if the puzzle is correctly solved.
Show numbers of digits yet to be filled.
When highlighting all related cells, highlights follow your cursor movements. (Otherwise follow your clicks.)
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First select a digit on the right side bar. Then click on the cells where you want to place the selected digit. You may enter more than one digit in a cell as a note by activating the pencil mark option near the upper left corner of the grid.