Create a new Scratch project and delete the cat sprite.

Show: How to create a new project in Scratch

---

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

We'll start off in modern times so add the 'Hall' backdrop from the backdrop library (as this is a modern scene).

Show: How to add a backdrop from the library

---

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.

Add the sprite called 'Dee' from the sprite library.

Drag the sprite to the left of the stage area (by holding down the left mouse button and moving your mouse).

Dee will say some instructions at the start. He will tell us how to transport to different time periods.

Add the following code to the Dee sprite:

when green flag clicked switch costume to [dee-b v] switch backdrop to [Hall v] say [Hi I'm Dee and I have a time travel machine!] for [4] secs say [Click on one of the items below to transport to that time!] for [4] secs

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.

We're going to create and use a variable called 'time' to set what time period to transport to. When we choose a time period, we will set the value of the 'time' variable and that will change the scene and characters based to that chosen time period.

After you create the variable, add the set [time] to now block to the boy sprite, underneath the when clicked block.

when green flag clicked set [time v] to [now] // insert this block here switch costume to [dee-b v] switch backdrop to [Hall v] say [Hi I'm Dee and I have a time travel machine!] for [4] secs say [Click on one of the items below to transport to that time!] for [4] secs

Show: How to create a variable

---

In the Variables palette, create a new variable by clicking the 'Make a Variable' button.

Once you click this button a box will appear asking what you want to call your variable. Give it a name that reminds you what you will be using it for. For example, if you wanted to keep track of your score in a game, you would create a variable called 'score'.

We're going to transport to different time periods by clicking on particular sprites. The first time period we're going to code is the time when dinosaurs roamed the earth.

Add the 'Dinosaur2' sprite from the sprite library, drag it to the bottom left of the stage area and add this code to it:

when green flag clicked set size to [50] % when this sprite clicked set [time v] to [dinos] switch backdrop to [Jurassic v]

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.

Next we will add some dinosaur sprites from the sprite library that will be displayed in our Jurassic scene (and they will be hidden for any other scene).

Choose 2 dinosaur sprites from the library and add them. You will need to add the following code to both sprites.

when green flag clicked forever if <(time) = [dinos]> then show else hide end

Once you've added the code to both of these sprites, test it out by clicking on the green flag and the clicking on the 'Dinosaur2' sprite. The Jurassic backdrop with the 2 dinos should be showing.

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.

Now that you've coded the first time period that you can transport to, add more time periods using the backdrop and sprite libraries.

For each time period you will need to:

1. Add a backdrop from the backdrop library
2. Add a sprite that will transport you when you click it
3. Add sprites to appear when the above sprite is clicked

For example you could transport into the future by adding the following:

• Backdrop library > Space City 1
• Sprite library > Planet2
• Sprite library > Kiran
• Sprite library > Dot

Add the following code to the Planet2 sprite:

when this sprite clicked set [time v] to [future] switch backdrop to [Space City 1 v]

Add the following code to the both the Kiran and Dot sprites:

when green flag clicked forever if <(time) = [future]> then show else hide end

Our first time period will be the time the dinosaurs roamed the earth! Add the 'Jurassic' backdrop from the backdrop library.

Show: How to add a backdrop from the library

---

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.