Build an Interactive Odd & Even Quiz Game in Scratch: A Step-by-Step Tutorial

Introduction: Odd & Even Quiz Game in Scratch

Are you eager to dive into Scratch coding and create a truly interactive math game that teaches core programming concepts while reinforcing basic arithmetic? You’ve come to the right place! In this Scratch quiz game tutorial, we’ll build an engaging Odd & Even numbers quiz—a classic math quiz game in Scratch that’s perfect for beginners and educators alike.

You’ll guide your players through random number challenges, where they’ll click Odd, Even, and Next buttons to respond and progress. Along the way, you’ll learn how to use random numbers in Scratch, operate with variables, implement decision logic, manage sprites and costumes, and create interactive feedback—all foundational elements of logic-building game design.

By the end, you’ll not only have a polished Quiz Game in Scratch to share with friends and students but also a deeper understanding of Scratch programming essentials.

Why Create an Odd & Even Quiz in Scratch?

1. Reinforces Math Concepts
   Players practice recognizing odd/even numbers on the fly—a great tool for reinforcing number sense.
2. Teaches Core Programming Logic
   You’ll use if-else logic, operators like mod, and Boolean conditions—all key constructs in any programming language.
3. Engages with Interactive Design
   Beautifully designed sprites, dynamic score updating, and key user feedback create a polished gameplay experience.
4. Builds Confidence in Scratch Development
   Through this Scratch project step-by-step, you’ll navigate sprite setup, variable management, control blocks, and event sequencing—all while keeping students motivated.
5. Scalable and Fun
   Want to add levels, timers, or sound effects later? This structure makes it easy to expand into a full-fledged logic game or interactive game in Scratch.

Scratch Code: Odd & Even Quiz Game in Scratch

Watch the full video tutorial here: https://www.youtube.com/watch?v=o-FEAKtsoa0

1. Environment Setup – Sprites, Backdrops & Design

1.1 Remove the Cat & Choose a Backdrop

• Open Scratch from scratch.mit.edu.
• Delete the default cat sprite by right-clicking and selecting delete.
• Click Choose a Backdrop, search for “light,” and select a simple, bright backdrop. This style keeps the interface clean and focused.

1.2 Add the Quiz Host: “Shasha”

• Click Choose a Sprite → Search for “Shasha”.
• Add your favorite pose, then open Costumes and pick the happier version for your game host.

1.3 Create Three Button Sprites

• Click Add Sprite, search “button,” and add one.
• Duplicate it twice so you have three buttons.
• Rename them in the Sprite List as:
  • Odd
  • Even
  • Next
• Customize each:
  • Odd → orange background, white border, white text
  • Even → green background, white text
  • Next → blue background, white text
• Select uniform color styles and shades to indicate interactivity.

These steps make your UI intuitive—students know exactly where to click and what each button does.

2. Variables & UI Display

Essential Variables

Go to Variables and create three variables:

1. number – Stores the random integer to evaluate. Set as visible and large for readability.
2. score – Tracks correct answers. Visible.
3. click button – A hidden variable managing button-state logic (0 or 1).

Configuring Variables

• Set number to display in the center of the screen in large style.
• Place score prominently at the top corner.
• click button remains hidden—used only for internal logic.

Initialization on Start

In Shasha’s script:

when green flag clicked
hide [number v]
set [score v] to [0]
set [click button v] to [0]

This ensures a fresh start each time the game runs.

3. Coding the Host (“Shasha”)

Shasha guides the player and introduces each round.

• Greeting Sequence

when green flag clicked
say [Hello, my friend.] for 2 secs
wait 1 sec
say [Tell me if this number is odd or even. Press the right button.] for 3 secs

• Reveal Random Number

show variable [number v]
set [number v] to (pick random [1] to [100000])

This code sequence ensures Shasha greets players first, then displays the challenge.

4. Button Logic – “Odd” and “Even”

a. “Odd” Button Script

when this sprite clicked
if <(click button = 0) and ((number mod 2) = 1)> then
    change [score v] by [1]
    say [Wow! You are correct!] for 2 secs
    set [click button v] to [1]
else
    say [Sorry, you are wrong. This is an even number.] for 2 secs
end

b. “Even” Button Script

when this sprite clicked
if <(click button = 0) and ((number mod 2) = 0)> then
    change [score v] by [1]
    say [Wow! You are correct!] for 2 secs
    set [click button v] to [1]
else
    say [Sorry, you are wrong. This is an odd number.] for 2 secs
end

Why this works:

• (number mod 2) checks the remainder:
  • 0 = even
  • 1 = odd
• The click button variable prevents repeated clicks on the same round.

5. “Next” Button Logic

Controls progression to the next round.

when this sprite clicked
if <(click button) = 1> then
    set [click button v] to [0]
    hide variable [number v]
    wait [1] secs
    show variable [number v]
    set [number v] to (pick random [1] to [100000])
else
    say [Please give the answer to the current question, then press 'Next'.] for 2 secs
end

This button resets after an answer and ensures pacing and order in gameplay.

6. Putting It All Together

Game Flow Recap

1. Click green flag → reset variables and reset the board.
2. Shasha greets the player, prompt appears.
3. number variable is displayed and a random number appears.
4. Player clicks Odd or Even:
   • Correct → score +1, feedback, click button = 1
   • Incorrect → feedback, click button = 1
5. Player clicks Next:
   • Moves on if click button = 1
   • Shows error if click button = 0

This full sequence forms a tight Scratch number guessing game.

7. Testing & Debugging

Test several scenarios to ensure the logic is solid:

• Clicking Next before answering should prompt you to answer first.
• Score shouldn’t increase for wrong answers.
• Button state resets each round.

If something’s broken, add a test line like:

say [DEBUG: click button = (click button)] for 2 secs

Use this to verify internal state quickly.

8. Additional Features & Enhancements

Explore possibilities to elevate your project:

1. Difficulty Levels
   Offer range options (1–20, 1–1000, 1–1,000,000) with choices upfront.
2. Countdown Timer
   Add a timer variable and countdown sequence for urgency.
3. High Score Tracking
   Use cloud variables for cross-session memory.
4. Visual & Audio Feedback
   Add sound effects for correct/wrong answers and sprite animations like confetti.
5. Multiplayer Mode
   Two-player alternating turns with alternating score counters.
6. Broadcast Events
   Convert green flag sequences into broadcasts like start and next question.
7. Accessibility
   Larger fonts, clear color contrast, and engaging colors for younger learners.

Conclusion

Congratulations—you’ve built an interactive, logic-driven Scratch quiz game from scratch! You learned to:

• Create sprites and customize costumes
• Manage variables and UI state
• Use mod logic for odd/even detection
• Handle event-driven sprites and interactive buttons
• Prevent invalid input with flow control using click button
• Provide dynamic feedback and progression

By watching the video and referencing this detailed blog, you now have both the why and how to build logic games with Scratch. Keep experimenting—add timers, layer in sound, or introduce multiplayer to expand your skills!

If you loved this Scratch project,

1. Don’t forget to check out the full video tutorial by Kodex Academy here: Quiz Game to Identify Odd and Even Numbers | Kids Coding Project
2. Like, comment & share the video
3. Visit kodexacademy.com
4. subscribe to the Kodex Academy YouTube channel for deeper Scratch content.

Happy coding with Kodex Academy! 🚀