This is a solitaire game where you score points by completing lines of 5 or more pieces. A new game starts with 3 pieces placed on the board with random colors and locations. Each turn, you must move one of the pieces to a new position that it can reach by sliding horizontally and vertically through empty cells. If the move results in a line (horizontal, vertical, or diagonal) of 5 or more pieces of the same color, the line is removed and you make another move. If the move does not result in a line, 3 more pieces are randomly added to the board. The game is over when the board is completely filled and no more moves are possible. Every line you remove scores points, and you score more points for "chains" where you create multiple lines in successive moves. There is a 3d variation where lines only need to be 4 pieces long to be removed.


The highlighted cyan piece can be moved to create a vertical line of 5 cyan pieces which will be removed. That will free up a space to form a line of 5 yellow pieces.