Scratch Game

Expert

45 mins

Teacher/Student led

+120 XP

What you need:
Chromebook/Laptop/PC or iPad/Tablet

Sea Battle - Part 2

In this project we make a game where you captain a ship and battle against submarines and planes! This is part two of this project.

Teacher Notes

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1 Complete part 1 of this project
2 Add 'score' and 'lives' variables
3 Score a point
4 Lose a life
5 Game over
6 Extra Challenges
Quiz

1 - Complete part 1 of this project

In a separate lesson you should have completed part 1 of this project. Open your project in Scratch and continue to the next step in this lesson.

Or if you wish you can use this starter project that has part 1 completed.

https://scratch.mit.edu/projects/293643968/editor/

2 - Add 'score' and 'lives' variables

We need to create 2 more variables to store our score and lives. Create the following variables:

'score' will store our score
'lives' will store how many lives we have left

Once you've created these new variables we can set their values for the start of the game. Add in the two new blocks under the when I receive [start] block in the battleship sprite:

Scratch: 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'.

👇 Mark your steps as done as you complete them.

+20 XP

3 - Score a point

Now let's add 1 to your score each time you hit a submarine.

In the submarine sprite, find the 'if touching my torpedo' code block and add the change [score] by 1 block into it.

Once you've added this block in, test that it works by playing the game. Each time you hit a submarine your score should go up by 1.

+10 XP

4 - Lose a life

Next add some code so you lose a life each time you get hit by an enemy torpedo.

Add the following new 'if then' group of blocks inside the forever block in the battleship sprite.

Test that this works before moving onto the next step.

Scratch: Using a tablet or iPad? Tap here for different controls

Since your tablet or iPad doesn’t have a physical keyboard, you’ll use on-screen buttons to complete this task. Wherever the instructions in this lesson mention pressing a key, you’ll need to tap a button on the screen instead. So, while your steps are a little different, you’ll still be able to make everything happen in your project.

So for example, instead of doing either of these:

You need to add an on-screen button (like an arrow sprite) and use this code:

Now, just tap the button on the screen to perform the same action!

+20 XP

5 - Game over

Finally add the following code finish the game when you've no lives left.

Again add the following new 'if then' group of blocks inside the forever block in the battleship sprite.

Scratch: Using a tablet or iPad? Tap here for different controls

So for example, instead of doing either of these:

You need to add an on-screen button (like an arrow sprite) and use this code:

Now, just tap the button on the screen to perform the same action!

+25 XP

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Copyright Notice
This lesson is copyright of Coding Ireland. Unauthorised use, copying or distribution is not allowed.

Scratch is developed by the Lifelong Kindergarten Group at the MIT Media Lab. It is available for free at https://scratch.mit.edu