Start a new Scratch project. Delete the cat by right-clicking it and selecting Delete.

Click on the stage. Choose a backdrop from the Scratch library: the night city with street backdrop is a good choice for this project. Delete the original blank backdrop.

Add a new sprite. select the Dog2 sprite from the Animals section.

Dog2 comes with three costumes. Delete the third costume dog2-c as we only want the first two.

Click on the blue i button to the top left of the sprite picture. Rename the sprite Toby

Select the left-right rotation style as shown on the picture below:

We want Toby to move right when we press the right arrow key. Click on the scripts tab, and add this script:

Click on the Green Flag, and check that Toby can move right when you press the right arrow key. Now we need to add more code to allow Toby to move left as well. Add this to your script:

Add a new sprite from the library: select the cheesy-puffs from the Things category, and rename it bowl.

Click on the Costumes tab and reduce the size of the cheese-puffs bowl by clicking on the shrink icon at the top near the scissors. You then need to click on the bowl sprite to make it smaller. The shrink icon looks like this:

If you used a different method to resize the bowl, you may need to reset the centre of the costume so that it is at the centre of the bowl. To do this, click on the Set costume centre icon at the top right corner, and move the crosshair as shown on the picture below:

The cheesy-puffs need to appear in random places on the pavement. The y position will remain the same, but the x position needs to change so that the bowl sometimes appears on the right, on the left, or in the middle. Add the following script to the bowl sprite:

Click the green flag, and wait for a bit. Does the cheese-puffs bowl keep moving to different places every 5 seconds?

At the moment, the game is too predictable! Let’s make it more difficult by hiding the bowl from time to time. Modify the script in the following way:

Create a bowls variable to keep track of how many bowls Toby has collected so far.

Now we need to add some code to keep track of how many bowls Toby has collected so far. Each time that Toby touches a cheese-puffs bowl, the bowls variable needs to be increased by 1. So add this script to the cheese-puffs bowl sprite. (Make sure that you keep the previous script as well! We need both scripts)

The game should be stopped when the number of bowls collected reaches 5. We are going to broadcast a new message called won to the other sprite and the background to let them know that the player has won.
Modify your second script so that it looks like this:

Add a small script for Toby so that he says ‘well done!’ when he receives the won message:

Add a new sprite: select the Beachball from the Scratch library.

Shrink the Beachball. Make sure that the centre of the costume is set correctly, i.e. at the centre of the ball. You can check this by clicking on the Set costume centre icon, located at the top right corner in the Costumes tab. It is important to set the centre correctly, as it will affect the way the ball moves.

Now we need this ball to fall from the sky, and bounce everywhere. Add the following script to your ball:

Modify your script so that when the ball touches Toby, it bounces off as well:

We also need to add some code to detect when the ball touches the floor. The ball seems to be touching the floor when its y position is less than 140. This is an approximate number, and you may need to adjust it, especially if you have chosen a different background.
We are going to modify the script so that the ball moves back to the top (and changes colour) as soon as it is dropped. Import the water drop sound, and modify your script again:

We now need to keep track of how many balls Toby has dropped so far. To do this, create a variable for all sprites called droppedBalls.

When we start the game, Toby has not dropped any balls yet, so we need to initialise the droppedBalls variable to 0. Each time the balls touches the floor, the droppedBalls variable needs to be increased by 1.
When the number of dropped balls is more than 3, the game is over, so we will broadcast a new message called gameover to tell the other sprites and the background that the game is over, and the player has lost. Your Beachball script should now look like this:

When the players wins, the game should stop, and the ball should stop bouncing and hide:

Add this script to your bowl sprite to stop it from appearing when the game is over:

Click on the stage. Then click on the Sounds tab, and import the spooky string sound from the Scratch library, and the triumph sound.

Add this script to the stage so that it plays a spooky string sound when the game is over:

Add this script to the stage so that it changes colour several times and plays a triumph sound when the player wins:

Finally, add this script to make sure the colour of the stage comes back to normal when the game is restarted.