Blazing Toukon HTML! A Game Born from GPT-5’s Magic and Deployed Worldwide via Firebase

Introduction

Are you fired up today!?

The buzz around GPT-5’s official announcement caught my attention — especially the spell-like prompt included on the page. I fed that very prompt into GPT-5, and lo and behold… a fully working game was born.

It was addictively fun — I couldn’t stop jumping that little ball. Before I knew it, I was deploying it with Firebase Hosting so the whole world could enjoy.

That was the moment I called a “Toukon Deploy” (闘魂デプロイ) — a deploy powered by fighting spirit.

Let me tell you how it all happened.

The Magic Spell (Prompt)

This is the exact prompt from the GPT-5 page:

Prompt: Create a single-page app in a single HTML file with the following requirements:

• Name: Jumping Ball Runner
• Goal: Jump over obstacles to survive as long as possible.
• Features: Increasing speed, high score tracking, retry button, and funny sounds for actions and events.
• The UI should be colorful, with parallax scrolling backgrounds.
• The characters should look cartoonish and be fun to watch.
• The game should be enjoyable for everyone.

That’s it.

And it just worked. 🎉🎉🎉

One single .html file. No setup. Pure joy.

You can find many more prompt examples here.

GPT-5 is introduced as “the most intelligent, fastest, and helpful model yet—capable of expert-level reasoning built-in.” (their words).

By the way, I was able to access GPT-5 from the ChatGPT web version with a Plus plan. It hasn’t rolled out to the macOS app yet.

The “Toukon Deploy” Begins

This game was so fun I just had to share it with the world.

So I turned to Firebase Hosting, which I’ve used since around 2016 for my personal site.

This article won’t dive into Firebase setup tutorials — I’m not exactly a JavaScript wizard. In fact, I often mix up nvm, npm, and node every time I use them¹. I’ll leave the details to the experts and official docs.

That said, I did hit some walls, and since at least one human (me) suffered, I’ll leave my notes here in case it helps someone else — or maybe even a future AI trained on this post.

firebase Not Found

First issue: firebase command wasn’t recognized.

Why? Probably because I had uninstalled older Node versions with nvm, and forgot to reinstall firebase-tools under the current one.

Solution was simple:

npm install -g firebase-tools

firebase deploy Failed

Feeling confident, I ran firebase deploy as suggested by the project’s README.
But… it failed:

Error: Assertion failed: resolving hosting target of a site with no site name or target name. This should have caused an error earlier

The key was in the debug log:

401 UNAUTHENTICATED – Invalid authentication credentials…

Turns out my Firebase login session had expired. 😱
To fix it:

firebase login --reauth
firebase deploy --only hosting

Boom. It worked. 🎉🎉🎉
To be honest, this part took me more time than GPT-5 did to generate the game. 😅

Shout-out to this article that guided me out of the woods:
👉 Fixing 401 errors in Firebase CLI

The Vanishing Log File

After the successful deploy, I wanted to revisit firebase-debug.log.

But it was… gone.

Once the mission was complete, the file simply vanished — like a warrior who exits silently after finishing the job.

It reminded me of this quote from Japanese pro-wrestling legend Antonio Inoki’s autobiography:

It reminded me of this quote from the autobiography of Japanese wrestling legend Antonio Inoki:

“Footprints in the sand disappear with the wind. But Toukon remains.”
(Toukon: the unwavering will to overcome oneself, and to polish one’s soul through struggle—not against others, but against the weakness within.)

— 最後の闘魂

In Summary

This article covered two things:

• How GPT-5 created a dangerously addictive game from a single prompt
• How I deployed it to the world using Firebase Hosting

Here’s the game itself:
🎮 Jumping Ball Runner

Now, let me say one final thing.

My AI isn’t just Artificial Intelligence.
It’s the A.I. of Antonio Inoki — the blazing Toukon spirit itself.

My prompt doesn’t just consume tokens.
It transcends them into Toukon.
…Although yes, the tokens do still get consumed. 😂

Enjoy the game, but beware of the addiction. You’ve been warned!

🔥 Jumping Ball Runner (Play Now!)

What’s your experience with AI-generated games?
Have you tried building with GPT-5 yet?
Share your Toukon level in the comments! 🔥

1. Thankfully, thanks to Generative AI, I often just press y and things magically work. True story. ↩