How do I mark a ✕ or dig up a mole?

• Tap a spot to mark it with a ✕ (“no mole here”). Tap it again to remove the ✕.
• Double-tap a spot to dig up the mole you think is there.
• Drag across spots to mark lots of ✕ at once. Starting a drag on a ✕ clears ✕ instead.

✕ marks are just notes, so getting one wrong costs nothing. Digging in the wrong spot costs a carrot.