Click on one of the buttons in the playing field
to subtract 1 from that button's value,
as well as from the values of the 4 surrounding ones.

Set all buttons to '0'.

• As soon as you click on "New", a new game starts.

• The score starts counting down from 1000.

• The quicker you finish, the higher your score will be.

• "Undo" and "Hint" as well as using more "Clicks" than the current difficulty setting requires,
  will all make you lose a couple points.