Create a new Scratch project and delete the cat sprite.

https://scratch.mit.edu

In this game there will be 3 sprites

1. a diver that you will control with your mouse
2. starfish that will appear in a random position and you will collect
3. a shark that will slowly follow and try and catch you

Show: How to create a new project in Scratch

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Go to the Scratch website using the link below and click on the 'Create' link in the blue bar at the top.

By default, each new project starts with the cat sprite already added. To delete the cat click on the x in the blue circle beside the cat in the sprite list.

https://scratch.mit.edu

Add the Diver1 sprite from the sprite library. We are going to program the diver to always point towards your mouse pointer and move towards it. This is how you will control where the diver swims to.

Add the following code to the Diver1 sprite.

when green flag clicked go to x (150) y (0) set size to (50) % forever point towards (mouse-pointer v) move (4) steps end

Show: How to add a sprite from the library

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To add a sprite from the sprite library follow these steps:

1. Put your mouse over the Choose a Sprite button
   
2. Click on the magnifying glass
3. Find the sprite you want in the library
4. Click on your chosen sprite

You can use search box or the filter links (Animals, People, Fantasy etc) to locate your sprite.

Add the Underwater 1 backdrop to the project.

Show: How to add a backdrop from the library

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To add a backdrop from the backdrop library follow these steps:

1. Put your mouse over the Choose a Backdrop button
2. Click on the magnifying glass
3. Find the backdrop you want in the library
4. Click on your chosen backdrop

You can use search box or the filter links (Fantasy, Music, Sports etc) to locate your backdrop.

Now add the Starfish sprite to your project.

Show: How to add a sprite from the library

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To add a sprite from the sprite library follow these steps:

1. Put your mouse over the Choose a Sprite button
   
2. Click on the magnifying glass
3. Find the sprite you want in the library
4. Click on your chosen sprite

You can use search box or the filter links (Animals, People, Fantasy etc) to locate your sprite.

At the start of the game the starfish will appear in a random position and each time you catch a starfish a new one will appear somewhere else.

Add the following code to the Starfish sprite to change it's size, hide it and create a copy of it.

when green flag clicked set size to (30) % hide create clone of (myself v)

We will program what to do when it's copied in the next step.

Now let's program what the starfish should do when a copy (or a clone) of it is created.

When the copy is created we will program it to:

1. go to a random position
2. make it appear
3. using the sense block touching [Diver1] ? keep checking if it is touching the Diver1 sprite and if it is create a new copy of it and delete this one

Add the following code to the Starfish sprite.

when I start as a clone go to (random position v) show forever if < touching [Diver1 v] ? > then create clone of (myself v)// create a new copy delete this clone // delete this one end end

Let's add some danger into the game!

Add the Shark 2 sprite from the library and the following code to make the shark appear in a random position and then start chasing the diver.

when green flag clicked set size to (50) % go to (random position v) forever point towards (Diver1 v) move (1) steps // slower than the diver end

Show: How to add a sprite from the library

---

To add a sprite from the sprite library follow these steps:

1. Put your mouse over the Choose a Sprite button
   
2. Click on the magnifying glass
3. Find the sprite you want in the library
4. Click on your chosen sprite

You can use search box or the filter links (Animals, People, Fantasy etc) to locate your sprite.

Finally let's add some code the stop the game if the shark catches the diver. Again we will use the block touching [Diver1] ? to sense that the shark sprite is touching the diver sprite and if it is then we will stop all the code so that the game is over.

Add the following new code to the Shark 2 sprite underneath the move 1 steps block.

when green flag clicked set size to (50) % go to (random position v) forever point towards (Diver1 v) move (1) steps // add new code under here if < touching [Diver1 v] ? > then stop [all v] end end

As an extra challenge can you add some extra code to keep score of how many starfish you collect before the shark catches you? 

What do you need to create and where do you add the new code?

see answer