def rocketLiftOff(currentForward, coords, startDrop, distance):
    """
    Controls the height of the rocket by simply increasing it by one each time.
    """
    global SelectedColour
    if (currentForward < startDrop) == 0:
        for i in range(0, len(coords)):
            coords[i][1] = coords[i][1] + 1
    return coords
