Share the configuration
The challenge link includes the seed, interval set and direction in its fragment. Opening it and starting the daily/shared-link mode reproduces the same initial material. It does not send a score, create an account or connect two browsers.
Choose a short custom code when you want a repeatable classroom or friend exercise. Both people can save their own records and compare the same task independently.
Keep a portable practice record
The JSON stores the configuration and answer data. The interval CSV is a compact table of initial and retry answers. Downloading is explicit; closing the tab without saving discards the local session.
A previous JSON can be loaded for comparison only when all configuration values match. The game checks answer identifiers and recomputes the prior score rather than trusting a supplied summary. Imported data does not replace your current answers.
Use generated audio as a practice aid
The current question can be exported as WAV with the same generated pitches and timing. This can help review a difficult interval outside the game. It is not a recording of your response or a full training course.
No outcome, certificate or specific improvement is promised. Keep the record as evidence of the questions answered and timing attempts made, and use it to choose a reasonable next practice session.