Dev builds typing game where your keystrokes play the music, in 3 days with Fable
vauvva · reddit · 2026-11-13
A developer used Fable 5.2 to build Typissimo, a web typing game where every correct keystroke plays a note on the beat, mistake-free words build the drums, and staying on pace pushes the track into Trance. Free, no account, mobile-friendly, live at typissimo.com. Workflow: Opus 5.5 wrote a long design brief (rhythm games, browser audio timing), then Fable built it in 3 days using subagents for separate parts, agent reviewers, and nearly 4000 tests. Notably, the model can't hear—every sound is synthesized in code with no samples, and it verifies the mix numerically (loudness, peaks, dropped notes); the developer plays it and gives feedback like "kick too boomy," which the model converts into numbers.
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