Initially activate the "Auto" option for converting single digit pencil marks into regular entries (only for initial setting, not changing the current mode).
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.
Best Time so far: 02:31
Press the button below to start this challenge.