1. Move all circles, vertically or horizontally, so they enter the gray areas.
  2. Show the movement of a circle by an arrow, with the tip of the arrow in a grey cell. The arrows do not bend, and do not cross other white circles or lines of other arrows, they go straight to their grey area.
  3. The number in a gray area must be equal to the total of the numbers of the circles which enter the area. Empty gray areas may have any sum total, but at least one circle (arrow tip) must enter a gray area.

List of puzzles