Hackathon: Solo Game in 2 Days with Fable 5 and Nano Banana 2

A developer built a game for a hackathon in two days, using their own game engine called o2, which is a ten-year pet project. The goal was to test if the engine is suitable for real game development and if AI can generate code and assets for it. The entire code was generated by Claude Fable 5, with the developer only reviewing, not writing. The success is attributed to the engine's compact size, detailed markdown documentation, and a strict rule of writing tests and reports for everything, which helps the AI stay on task. Art was generated using Nano Banana 2, but controlling style and technical requirements was challenging. The developer created a node-based tool (assetsline) to build pipelines that inherit style from a concept, and used scripts to generate buildings, props, and road tiles with strict isometric constraints. Sound and music were generated via ElevenLabs, and video animations were inserted with a chroma key cut by a shader. The developer sees both pros and cons of AI-generated games, noting that while it may lead to a flood of low-quality games, it also lowers the barrier for solo developers to implement ideas, shifting competition to game design and gameplay.