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What's the difference?

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All stages · Demo 250

IMO hull

Choice tanker / bulk / other. An IMO number is seven digits; the last is a weighted remainder. Jev never multiplies 7. Six digits need 7.

ChoiceIMO checksum in JS

A digit tape. 9074729 books a tanker. A last-digit flip rejects. Six digits never pass.

replaykind —imo —

STANDBY

All 4056 stages

Educational stage on jev.page — not the official TypeSafe console. Live calls go to POST https://api.typesafe.ai/v1/systemone from your browser when you paste a key. Without a key, the stage plays a recorded decision shaped like jev-1.13.0. Jev does not write the UI copy.