Press "Play Again" to play again, that's pretty much it. When it asks you your x coordinate, remember: it is a graph. X is across the screen from right to left, and y is up and down. The center of the screen is 0, 0, meaning that the x coordinate it 0, and so is the y coordinate. TIPS: 180 is about the edge of the screen. So 180 as the x coordinate will put the missile pretty much to the right of the screen. -180 will put it at the left of the screen, if the y coordinate is 180, it will be at the top of the screen, -180 as the y coordinate will get you to the bottom.
@couscous helped me fix some glitches, @Epic_Banana for some of the programing.
