How to Create an AI Chat with Gemini in Construct 3

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Published on 26 Aug, 2025.

Ever dreamed of creating NPCs that can truly converse, or game worlds that react dynamically to player questions? This guide shows you how to bring the power of a conversational AI like Gemini directly into your Construct 3 projects. A recent video inspired me to dust off this idea and create an updated guide.

I had explored AI integration in the past, but technologies evolve quickly. While earlier AI tools had their limits, today's powerful models like Gemini have completely changed the game. The focus now is all on ChatBots like ChatGPT and Gemini; incredibly powerful tools, despite their limitations. Integrating these models into the Construct 3 canvas with JavaScript unlocks fascinating creative possibilities, from NPCs with dynamic personalities to procedurally generated quests and lore.

By the end of this guide, you won't just connect to an API; you'll have built a functional chat system with memory, ready to be integrated into your own games.

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  • Good tutorial. I'm not sure how memory is normally achieved, but sending the entire chat back to the ai each prompt does not sound good. It will use an exponentially larger amount of tokens. Not sure how it will effect the free tier, but it will cost you a fortune if you have to pay.

    • Hi, thank you for the comment!

      You're right, sending the full history increases token usage. This method is necessary because models like Gemini are stateless and need that history for context. For a real application, it's vital to manage this to control costs. Common solutions include using a "sliding window" of recent messages or summarizing the chat.

      From a game design perspective, I also believe it's better to guide the AI instead of allowing completely free chat. Using structured output helps maintain creative control over the game's narrative, a topic I hope to explore soon.