Start a new Scratch project - "File" and then "New"
Delete the cat sprite; right click and select "Delete".
Add a new sprite by clicking on "Paint new sprite".
Use the "paint" facility to make a small ball
Use the "elipse" tool to draw a circle. Make sure that you use the filled elipse and if you hold "shift" while you draw it will be a circle not an elipse (although a circle is a special elipse mathematically speaking).
Press "OK" to save the sprite.
The sprite is called "sprite1" and sw need a better name than this.
To make the bat create a new sprite by clicking on "Paint new sprite".
Use the line tool to draw a short line parallel to the bottom of the screen.
Rename the sprite as "paddle"
Now give the ball this script.
Give the paddle this script.
See if you can make the ball bounce on the paddle.
You will need a variable to store the number of lives that you use up (if you miss the ball!)
Make a variable called "Lives".
Lives should be visible on the screen.
Add this script to the stage.
Now create a floor for the ball to land on if you miss.
Create a new sprite and draw a straight line the width of the screen.
This is the line, it will appear inthe middle of the screen.
Add this script to the floor to make it move to the right place by itself.
Now change the script for the ball to include the floor.
Note that when the ball hits the floor it will start at the centre of the screen again.