get stuck or make a wrong move, you can clear all your moves by clicking on clear button, or undo your last move by clicking on the undo button. both of these buttons are located just below the cube. you cannot cross the pathways. there must be a solid line of the same color from one square to the other, and you cannot go diagonally. you also cannot cross the black paths or squares. when you need to turn the cube in order to see another side - move your mouse up / down , left / right. 