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A verified author comment shares the full prompt that the root post says was run against GPT-6 and Gemini 4. It requests a playable browser-based Three.js tram game set on floating Mediterranean-style islands, with driving controls, passenger-comfort scoring, stations, upgrades, and mobile support.
State which objects must remain separate, named and editable; otherwise a visually convincing shell may still be unusable.
Ask the model to run the scene, inspect visible failures and repeat until concrete frame-rate, interaction and layout checks pass.
For large worlds, split the work into districts, assemblies or milestones and approve each section before expanding scope.