GPTGTA

A playable top-down GTA-style browser sandbox built through GPT-driven coding.

To the best of my knowledge, GPTGTA is one of the first public GPT-native top-down GTA-style browser sandboxes.

GPTGTA is a solo experiment in LLM-native game development: browser-native HTML/CSS/JS, retro top-down crime sandbox mechanics, mobile controls, a board editor, custom tilesets, stealable vehicles, pedestrians and collision systems.

Play versions View prototype status Read first-mover note

Playable version archive

Play GPTGTA versions

Every public build below is playable from the version archive. v1.2 is intentionally omitted because its movement controls were broken.

Open /version/

First playable slice

Early browser runtime with the first top-down driving and sandbox proof.

PLAY v1 →

Mobile controls

iPhone-friendly touch joystick, enter/exit button and mobile HUD direction.

PLAY v2 →

Vehicles & damage

Wider roads, parked cars, vehicle handling types, collision damage and HP.

PLAY v3 →

v3.1

Reverse driving fix

Vehicle facing and velocity separated, sidewalks/crosswalks added, pedestrians improved.

PLAY v3.1 →

Rooftop collision test

City structure with roofs, water, trees, bridges, solid collision and traffic chaos.

PLAY v4 →

Running prototype

Top-down browser runtime
Mobile controls
Stealable vehicles
Collision and damage tests

Board editor

PNG asset palettes
Layer-based map painting
Export/import board JSON
Playable edited boards

Asset pipeline

Roads and base tiles
Vehicles and pedestrians
Roofs, props and overlays
Retro city atmosphere

First public documentation point

Positioning note

GPTGTA documents a GPT/ChatGPT-driven workflow for building a retro top-down crime sandbox in the browser. The claim is intentionally careful: this is not presented as a legal or academic proof of absolute priority, but as public documentation of a working prototype and development direction.

Safe claim: “GPTGTA is a playable top-down GTA-style browser sandbox built through GPT/ChatGPT-driven prompting and vibecoding.”

Independent project disclaimer

GPTGTA is not affiliated with Rockstar Games, Take-Two Interactive, Grand Theft Auto, GTA, or DMA Design. It is an independent GPT-built top-down crime sandbox experiment inspired by early top-down open-world games and retro browser game development.