Threshold Moment
A first-run experience that teaches by letting you break things safely. Built for The First Ninety Seconds — design the opening 90 seconds of a product a stranger has never seen. Sandboxed first-run with an undo timeline. The interface is deliberately narrow: one path, done properly, rather than a broad surface that half-works at the deadline.
Gallery
Screens
Threshold Moment — main view
Threshold Moment — result state
On the clock
What shipped, what didn't
Completed in time
Sandboxed first-run with an undo timeline.
Unfinished / faked
Undo only covers the tutorial actions.
Obstacles
Lost four minutes to an auth redirect loop that turned out to be a trailing slash.
Lessons learned
The demo path is the product. Everything not on it can wait for next time.
Process
Prompting approach
Started from a single system prompt describing the user and their constraint, then iterated with the assistant on the Threshold Moment data model before writing any interface code. Full prompt log is in the repository under /prompts.
Fairness
Disclosures
Declared by the builder at submission time, visible to judges before scoring.
Discussion
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