🏆 Launch week. The first commercial Steam release we are featuring, with a full creator interview.
“Wake from cryosleep on a dying space station prison and guide a remote droid to your own rescue. A lightning-fast, real-time, grid-based dungeon crawler with traditional sprite design. Free demo available.” (excerpt from the source)
How a solo dev shipped a 100,000-line AI-assisted game
Twin (Twin-FX) (@TwinTowerCity) made Captive 3000. These are the answers, word for word.
How did you split the work between the AI tools? Which one did the heavy lifting?
“The first 2,000 lines were written in ChatGPT about a year ago. When the code outgrew that workflow I moved to Cursor, mainly using Claude Opus. It's now about 100,000 lines of JavaScript, and the music was made with Suno, and the graphics with ChatGPT and OpenArt. Grok Bot was used for marketing and outreach. The game runs in a browser at Captive3000.com (including on iPad/tablet), and on Steam.”
What was the hardest part of building a full commercial game this way?
“Time, and credits. Pretty much anything can be created with AI but it's a myth that anyone can 'one prompt' a commercially viable game. I spent hundreds of hours working on Captive 3000 over a year and it consumed a lot of AI credits.”
Was there a moment where the AI surprised you, for better or worse?
“I was pleasantly surprised by the way AI kept improving over the course of a year. It was so much better by the end of the year that I went back and recreated a lot of my early graphics. It became easier to create graphics and develop code as the models improved, and this process will only accelerate. AI will continue to evolve. Just as I finished the game, Grok Bot was released and I started using that for marketing and admin.”
How long did it take from the first prompt to the Steam release?
“About a year, from those first ChatGPT-generated lines to the Steam launch on 6 November 2026. I'm a solo indie developer with an IRL job so I worked on the game in my spare time.”
What would you tell someone who wants to ship their first AI-assisted game?
“When I started working on Captive 3000 I didn't know I would eventually build a commercial game. It started as just a bit of fun. I originally wanted to create a simple browser-based 3D maze puzzle game. But after a while I realized if I kept working on it I could create a commercially viable product. I learned the steps as I went along and I had no idea what I was doing at the beginning! So my advice is just start, even if you don't know what you're doing, you'll figure it out along the way.”
On Steam
AI tools usedChatGPTClaude Opus (via Cursor)CursorOpenArtSunoGrok Bot
Developer / publisher
Twin-FX
Steam release
Nov 6, 2026
Grid-based sci-fi dungeon crawler. The press kit places it in the lineage of Captive, Dungeon Master and Eye of the Beholder.
The free demo is the first three levels (about three hours), and progress carries over.
Buying on Steam also unlocks browser play, including iPad and tablet.
Creators may make monetised videos and streams freely.
🧬 Game DNA
Genes: genre · engine · multiplayer · mobile. Colors are shared across the site, so matching colors mean matching traits.
A solo developer, Twin of Twin-FX, shipped this AI-assisted dungeon crawler on Steam in November 2026.
“Time, and credits. Pretty much anything can be created with AI but it's a myth that anyone can 'one prompt' a commercially viable game. I spent hundreds of hours working on Captive 3000 over a year and it consumed a lot of AI credits.”
Built on Twin's own custom JavaScript engine and level/map designer, with no commercial engine. He says the same tools could be reskinned for future crawlers, like a medieval fantasy one.
This is not a vibe-coded game, so there is no Starter recipe for it here.
From Twin's dev notes
Quoted from Twin's development notes, with his permission.
His approach
“Treat each tool as one step in a pipeline rather than a magic button.”
The PowerPoint trick
“PowerPoint let me take one flat, front-facing wall and drag its 3D rotation and perspective until it sat exactly in each slot, by eye, with no maths.”
Music
“For every 10-20 tracks created I only kept one. I used the best tracks as input references for other tracks to maintain a consistent sound.”
Keeping the AI on track
“Document all changes and additions to the game code in a separate “Dev Notes” document to help bring the AI agents back up to speed when they lose context.”
The pipeline
“The tools will change. The pipeline should not: plan, generate, refine, test, ship.”
Toolchain. Claude (story), ChatGPT and Grok (art), OpenArt (animation), PowerPoint and Canva (faux-3D walls), Suno and Audacity (music and SFX), Cursor with Claude and Grok models (code).
At a glance
How was Captive 3000 made?
A solo developer, Twin of Twin-FX, shipped this AI-assisted dungeon crawler on Steam in November 2026. In the creator’s words: “Time, and credits. Pretty much anything can be created with AI but it's a myth that anyone can 'one prompt' a commercially viable game. I spent hundreds of hours working on Captive 3000 over a year and it consumed a lot of AI credits.”
Does Captive 3000 work on phones?
Probably not well. We could not confirm touch controls, so a keyboard or mouse may be needed.
Is Captive 3000 multiplayer?
Not stated in the source.
Where can I play Captive 3000?
The free demo is on Steam and in the browser. Buying on Steam also unlocks browser play, including iPad and tablet. Vibe1Up links to both and doesn't host the game.
