Move your mouse and help the square squeeze in a tight gap. The main menu will give you an option to view the instructions or start the game immediately. You will see a white background on the start of the game. A square rests in the middle and whenever you move your mouse the square will move as well. The black square also changes in size constantly. You may see it enlarge itself and shrink back after a few seconds. Not long after the game starts, a black vertical line will show up from the right going to the left side. The only thing that stops the straight line is a small gap placed randomly along the line. You can only fit the box when it shrinks in size so wait for it to be small enough before moving it through the gap. After a successful pass you are then confronted with another obstacle and the whole process repeats itself. You must be ready to react and move faster as the some lines accelerate past others before it. When this happens, you must look at the size of the square and make sure it is small before moving into the obstacle.