Mark a cell as a black square only if you’re sure of your answers. As a rule, mark each white cell on the grid with an X if you are sure it is not black.As an X (which is a way of stating you are certain the cell is not black).This represents a row or column that has groups of shaded squares separated by at least 1 blank square. Many of the rows and columns have hints that shows 2 or even 3 numbers.Every number represents the number of shaded squares on the row or column.Use the numbers on the left and top side of the grid to identify the location of the shaded squares.Find the location of the shaded squares on the grid.Enlarge: Lets you switch between full screen and windowed modes.Sound: Turns the game’s audio effects on and off.Music: Turns the game’s music on and off.Query: Checks if your current answers are correct.The game’s main indicators are situated on the left side of the screen.Tap on the screen with your fingers to mark a tile.Select tiles once to mark them black, twice to put an X in them, and a third time if you want to unmark the tile and put it back to the original white state.With your mouse, left click to mark a tile.