Peter Yang says Fable 5.2 built a playable kart racer in 3 prompts
Peter Yang says Fable 5.2 built his browser kart racer in three prompts, with drifting, items and multiplayer. He later added Suno music and turned his child's drawings into racers.
TL;DR
- A playable browser kart racer took three prompts, Peter Yang said in his update.
- Mobile support and multiplayer came from short follow-ups, including “Ok let's add multiplayer the simplest way,” Yang wrote in a reply.
- Later customization included Suno-generated music and racer designs based on his eight-year-old's drawings.
Yang clocks the Fable 5.2 build-and-revision exercise at 62 minutes, versus 34 minutes for Opus 5.5, in his comparison video. The playable Turbo Tails build now has a three-race Grand Prix and touch controls.
Mobile and multiplayer
Two of the three prompts were almost comically short, Yang explained [in his reply]about the prompts:
- “Let's make mobile work please”
- “Ok let's add multiplayer the simplest way”
His published demo advertises:
- A 3D game that runs directly in the browser.
- Six racers, with drifting, ramps and items.
- Single-player and multiplayer modes, available to play free.
Three.js and self-review
The initial brief specified a visually ambitious, single-track browser racer inspired by Mario Kart, with Three.js and models created in Blender. Yang's video walkthrough describes a self-review loop:
- Have each model build its game from the brief.
- Ask it to critique its own result and make another iteration.
- Ask Fable for three additional polishing passes.
The video therefore documents more iteration than the three-prompt post alone describes. Yang also said he intended to keep improving the game after sharing it.
In a later message, he asked the agent to keep playtesting and make at least one more round of improvements while he watched Demon Slayer.
Suno soundtrack
Yang generated the music in Suno, then told Claude to add it to the game. That attribution came in response to a question about the soundtrack.
Child-drawn racers
His eight-year-old's drawings supplied the most charming customization: Yang turned them into kart-racer designs for a planned character upgrade.
Three-track Grand Prix
Yang initially floated adding a full circuit. The current Turbo Tails menu lists three selectable tracks:
- Coral Cove: beach.
- Thunder Temple: jungle.
- Magma Peak: volcano.
The game also exposes two control schemes:
- Desktop: arrow keys to drive; Space to hop, drift or perform tricks off ramps; Shift for turbo; E for items.
- Touch: drag to steer, with separate drift, turbo and item controls.
Drifts, tricks and coins refill the turbo meter.