Scratch is a programming language which uses blocks to build the program activity. It's a bit like building with Lego, except you build from the top down, instead from the bottom up.

Sprites are the the characters and they can be created, downloaded or used from the stock library. Backgrounds can be from an image downloaded, a created image or used from the stock library.

This is the Scratch main interface screen, note the green flag, both at the top right and within the Scratch screen.

This is the entry screen and on the right are instructions.

The 'See inside' button takes you to the code.

On this screen you can see the two Sprites used in this game.

Each Sprite has it's own Scratch code. The Ball Sprite selected has the code on the right. If the Paddle code was selected a different set of codes would appear.

In this case the code also has some instructional notes.

In the Scripts window there are 10 link windows: Motion, Looks, Sound, Pen, Data, Events, Control, Sensing, Operators and More Blocks. Link here for what's behind these windows.

Once you become familiar with how the Scratch works, you can change some of the variables to see what happens. For instance the block 'turn, pick random 160 to 200 degrees' - you could change the numbers to 200 to 300 degrees and see what happens. You could then try another variable change.

This is the link for the above example used. https://scratch.mit.edu/projects/10128515/#editor.

This is the link to some sample Scratches.

Having looked at the examples it is time to build Scratches using the 10 activities links below. The Activities Index gives details and links for each activity. Initially use the exact code as shown. Later on you can make changes to the code.