

Clicking them again brings the squares in their original state. Clicking them again will mark them with an X you can use this sign to track the squares that you consider to be empty. You can click the squares once in order to mark them as occupied. For example, 1 5 2 means one square, 5 squares and 2 squares, in this order, separated by one or more spaces between them. You can do this by looking at row/column definitions: a sequence of numbers that describe groups of consecutive squares appearing on that row/column. The purpose of this game is to discover a board made up of blue squares and free spaces.
