Click on an intersection to rotate the ice blocks clockwise; shift-click to rotate the ice blocks counter-clockwise. Connect 3 or more ice blocks of the same color to clear them. New ice blocks grow periodically off of the old ones (see the timer in the bottom right). If the Ice-9 grows past the edge, all is lost! Save the Ice-9! Save the world! Note that black ice blocks are immobile and can not be destroyed.