Develop browser games with Gemini 3 Pro Canvas

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Gemini 3 Pro Canvas Coding Game Dev

Step-by-step process of creating a Galaga-style game using Gemini 3 Pro's Canvas, asking for prompts, running the code, and iterating on features.

Using Thinking Models First

Do not ask the coding AI (Gemini) to brainstorm the game mechanics from scratch. Use a 'Thinking Model' first to generate a detailed functional spec, then feed that spec to Gemini for coding. This produces higher quality code.

The 'Fresh Chat' Rule

If a feature update breaks the UI (e.g., overlays blocking the game) and one follow-up prompt doesn't fix it, abandon the chat. Starting a fresh chat with the consolidated requirements is often faster than debugging via chat.

Phantom API Requests

Gemini may occasionally hallucinate a requirement for an API key when code errors occur. If the game logic shouldn't require external data, this is a bug—restart the prompt rather than trying to provide a key.

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