Making A Simple Game In Scratch

Introduction

Scratch is a visual programming language designed to make coding accessible and fun, especially for beginners and young learners. With its drag-and-drop interface, you can create interactive stories, animations, and games without prior programming experience. This guide will walk you through the process of making a simple game in Scratch, step by step, covering everything from setting up your project to adding interactive elements and scoring. By the end, you'll have a playable game and a solid understanding of Scratch's core features.

Making A Simple Game In Scratch

Time Estimate

• Approximately 45–60 minutes for beginners.

Materials Needed

• A computer or laptop with internet access
• A free Scratch account (optional, but recommended for saving your project)
• Web browser (Chrome, Firefox, Edge, or Safari)
• No additional software installation required

Step-by-Step Guide

1. Set Up Your Scratch Project

• Go to the Scratch website (https://scratch.mit.edu) and sign in or create a free account.
• Click "Create" in the top menu to start a new project.
• Familiarize yourself with the Scratch interface: the stage (where your game appears), the sprite list, the blocks palette, and the scripting area.
• Optionally, rename your project by clicking on "Untitled" at the top and entering a descriptive name like "Catch the Apple Game".

Setting up a new Scratch project and exploring the interface

2. Choose and Prepare Your Sprites

• Delete the default Scratch cat sprite if you want a different character by right-clicking it and selecting "delete".
• Click the "Choose a Sprite" button to add a new sprite for your player character (e.g., a basket or a new animal).
• Add another sprite for the falling object (e.g., an apple), using the "Choose a Sprite" button or drawing your own.
• Position the player sprite at the bottom of the stage and the falling object sprite near the top.

Choosing and positioning sprites for the player and falling object

3. Create the Player Movement Controls

• Select the player sprite and go to the "Events" category in the blocks palette.
• Drag the "when green flag clicked" block to the scripting area.
• Add code to move the player left and right using the arrow keys. For example:

when green flag clicked
go to x: 0 y: -140
forever
  if <key [right arrow] pressed?> then
    change x by 10
  end
  if <key [left arrow] pressed?> then
    change x by -10
  end
end

• This code positions the player at the bottom and allows movement with the arrow keys.

Adding arrow key controls to move the player sprite left and right

4. Program the Falling Object's Motion

• Select the falling object sprite (e.g., the apple).
• Add the following code to make it fall from the top to the bottom:

when green flag clicked
go to x: pick random -200 to 200 y: 180
show
forever
  change y by -5
  if <y position < -170> then
    go to x: pick random -200 to 200 y: 180
  end
end

• This code makes the object fall and reappear at the top at a random horizontal position when it reaches the bottom.

Programming the apple to fall and reset to the top at random positions

5. Detect Collisions and Score Points

• Still on the falling object sprite, add code to detect when it touches the player sprite and increase the score.
• Create a variable called "Score" by clicking "Variables" > "Make a Variable".
• Add the following code:

when green flag clicked
set [Score v] to 0
go to x: pick random -200 to 200 y: 180
show
forever
  change y by -5
  if <touching [Basket v]?> then
    change [Score v] by 1
    go to x: pick random -200 to 200 y: 180
  end
  if <y position < -170> then
    go to x: pick random -200 to 200 y: 180
  end
end

• This code increases the score by 1 each time the object is caught by the player.

Adding collision detection and scoring logic to the falling object sprite

6. Add a Game Over Condition

• Decide on a game over condition, such as missing the falling object a certain number of times.
• Create a variable called "Misses" to track missed objects.
• Modify the falling object code to increase "Misses" when the object reaches the bottom without being caught, and stop the game after a set number of misses:

when green flag clicked
set [Score v] to 0
set [Misses v] to 0
go to x: pick random -200 to 200 y: 180
show
forever
  change y by -5
  if <touching [Basket v]?> then
    change [Score v] by 1
    go to x: pick random -200 to 200 y: 180
  end
  if <y position < -170> then
    change [Misses v] by 1
    go to x: pick random -200 to 200 y: 180
  end
  if <(Misses) > 5> then
    say [Game Over!] for 2 seconds
    stop [all v]
  end
end

• This code ends the game after 5 missed objects and displays "Game Over!".

Implementing a game over condition based on missed objects

7. Customize the Background and Sprites

• Click the "Choose a Backdrop" button to select or draw a background for your game (e.g., a park, sky, or kitchen).
• Edit your sprites using the "Costumes" tab to add color, details, or facial expressions.
• Add sound effects by clicking the "Sounds" tab and choosing or recording sounds for catching or missing objects.
• Test your game to see how the new visuals and sounds enhance the experience.

Customizing the game's background, sprites, and adding sound effects

8. Add Instructions and Start Screen

• Create a new backdrop or sprite for the start screen with instructions (e.g., "Catch the apples! Use arrow keys to move.").
• Use the "when green flag clicked" block to show the start screen and wait for the player to press a key (e.g., spacebar) to begin.
• Hide the start screen and show the game sprites when the game starts.
• Example code for the start screen sprite:

when green flag clicked
show
go to front
repeat until <key [space] pressed?>
  wait 0.1 seconds
end
hide
broadcast [Start Game v]

• Use the "when I receive [Start Game]" block on other sprites to start the game logic.

Adding a start screen with instructions and a prompt to press space to begin

9. Polish and Test Your Game

• Play your game several times to check for bugs or unexpected behavior.
• Adjust the speed of the falling object, the number of misses allowed, or the size of the sprites for better gameplay.
• Ask friends or family to try your game and give feedback.
• Save your project regularly and consider sharing it on the Scratch website for others to play.

Testing and refining the game for better playability and bug fixes

Tips

• Use the "duplicate" tool in Scratch to quickly create similar sprites or scripts.
• Keep your code organized by using comments and grouping related blocks together.
• Explore Scratch's tutorials and community projects for inspiration and advanced features.