# Gemini 3 Coded a 3D Game From ONE Prompt Source: https://www.youtube.com/watch?v=eaaTRr3zDMY Recap page: https://rapidrecap.app/video/eaaTRr3zDMY Generated: 2025-11-14T13:04:21.173+00:00 --- ## Quick Overview The Gemini 3 model successfully generated and executed a fully playable, Minecraft-style 3D game called "WizardCraft Realms" from a single prompt, demonstrating superior agent coordination and capability compared to the older Codex 5.1 models, which required extensive manual iteration and multiple subagents to achieve a less complete result. **Key Points:** - Gemini 3 built the complete, playable 3D Minecraft-style game "WizardCraft Realms" using only the initial prompt, coordinating four distinct subagents. - The resulting game features procedural world generation, player movement (WASD), mining/harvesting (left-click), block placement (right-click), and multiple magical realms. - The Codex 5.1 process for the same task required manual iteration, 40+ tool calls, and resulted in a less feature-complete 2D game initially. - The final Gemini 3 output included a detailed README, spell system design, world system, and core rendering engine, all completed through automated agent coordination. - The speaker demonstrated the game's functionality, including movement and harvesting, noting that while the initial 2D version from Codex was playable, the Gemini 3 version is a full 3D experience. - Gemini 3 utilized 6 to 10 tool calls per subagent, utilizing significantly fewer tokens overall compared to the iterative process required by Codex 5.1. ![Screenshot at 00:09: The Claude Code environment shows the Gemini 3 model launching multiple subagents in parallel \(Build core rendering engine, voxel world system, wizard player system, magic spell system\) to construct the complex game systems simultaneously.](https://ss.rapidrecap.app/screens/eaaTRr3zDMY/00-00-09.png) **Context:** The video compares the capability of the newer Gemini 3 model against the older Codex 5.1 model when tasked with a complex coding challenge: creating a fully functional 3D game based on a single, descriptive prompt. The host sets up a development environment using a tool called Claude Code, which manages agent execution, and compares the efficiency and final product of both AI models for building the game "WizardCraft Realms." ## Detailed Analysis The video demonstrates the vastly improved capabilities of Gemini 3 over Codex 5.1 by challenging both models to create a complex 3D game, "WizardCraft Realms," from a single prompt. Gemini 3 successfully used parallel subagents (four distinct ones: rendering, world, player, and spell systems) to build the entire, fully playable 3D game, including documentation and a README, using relatively few tool calls and tokens. Conversely, the Codex 5.1 attempt required significantly more manual iteration, used many more tool calls (totaling over 40), and ultimately produced a simpler, less complete 2D game. Upon launching the Gemini 3 generated game, the host confirms functionality, showing movement and harvesting in the 2D Overworld realm, though the 3D aspects were still developing in the background execution. The success of Gemini 3 lies in its ability to coordinate multiple specialized agents effectively to handle the complexity of the project scope defined in the initial prompt. ### Initial Prompt Comparison - Gemini 3 used one prompt to start multi-agent parallel work - Codex 5.1 required manual iteration and multiple follow-up prompts to reach a similar stage ### Codex 5.1 Limitations - Required ~40 tool calls across agents and resulted in a basic 2D game structure initially - Used far more tokens per task, indicating less efficiency ### Gemini 3 Agent Coordination - Launched 4 subagents (rendering, voxel world, wizard player, magic spell) in parallel, utilizing between 6 to 12 tool uses each - Showed excellent coordination, updating progress files efficiently ### Final WizardCraft Game - Resulted in a complex, playable 3D game with features like procedural generation, 5 unique realms, physics, and UI polish - Included comprehensive documentation (README) and project structure files. ### Game Demonstration - Host loads the game, confirming basic controls (WASD, left/right click for mining/building) and showing the 2D Overworld area with inventory tracking. ![Screenshot at 00:05: The host introduces the comparison between OpenAI Codex 5.1 and Gemini 3 for game development.](https://ss.rapidrecap.app/screens/eaaTRr3zDMY/00-00-05.png) ![Screenshot at 00:14: The host shows the Gemini 3 output running on a mobile device, demonstrating initial success with the prompt.](https://ss.rapidrecap.app/screens/eaaTRr3zDMY/00-00-14.png) ![Screenshot at 00:24: The screen shows the initial 'Talk to Gemini live' interface before starting the voice interaction.](https://ss.rapidrecap.app/screens/eaaTRr3zDMY/00-00-24.png) ![Screenshot at 00:35: The host prompts Gemini 3 to speak in a strong Manchester accent, testing voice capabilities.](https://ss.rapidrecap.app/screens/eaaTRr3zDMY/00-00-35.png) ![Screenshot at 01:15: The host challenges Gemini 3 to guess his accent after demonstrating its voice capabilities.](https://ss.rapidrecap.app/screens/eaaTRr3zDMY/00-01-15.png) ![Screenshot at 02:09: The coding environment displays the switch to Codex, where the agent is running tasks in parallel, showing token usage.](https://ss.rapidrecap.app/screens/eaaTRr3zDMY/00-02-09.png) ![Screenshot at 02:23: The 3D game "WizardCraft Realms" loads, displaying controls and the initial blue sky/terrain view.](https://ss.rapidrecap.app/screens/eaaTRr3zDMY/00-02-23.png) ![Screenshot at 03:33: The host inputs the revised, more complex prompt into Claude Code for Gemini 3 to execute.](https://ss.rapidrecap.app/screens/eaaTRr3zDMY/00-03-33.png) ![Screenshot at 04:50: The Claude Code interface shows Gemini 3's subagents actively working in parallel, indicated by ongoing task progress bars and token usage.](https://ss.rapidrecap.app/screens/eaaTRr3zDMY/00-04-50.png) ![Screenshot at 06:58: The final game interface loads, showing the 2D Overworld map, HUD, inventory, and controls panel.](https://ss.rapidrecap.app/screens/eaaTRr3zDMY/00-06-58.png)