Underneath the addGameScreen() function, create a new function called dragPaddle(event):

function dragPaddle(event)

Next, we'll focus on moving the paddle side to side within the boundary of the game screen. Add in the following block of code to enable paddle movement in the simulator and then close the function. The reason for adding this block is because the simulator does not support accelerometer events:

  if isSimulator then

    if event.phase == "began" then
      moveX = event.x - paddle.x
    elseif event.phase == "moved" then
      paddle.x = event.x - moveX
    end

    if((paddle.x - paddle.width * 0.5) < 0) then
      paddle.x = paddle.width * 0.5
    elseif((paddle.x + paddle.width * 0.5) > display.contentWidth) then
      paddle...