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What's the difference?

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All stages · Demo 304

Finnish HETU

Choice hetu / tmp / other. DDMMYY, +/−/A, three digits, then a 31-char check. Jev never tables 31. Missing check never pass.

ChoiceHETU mod-31 in JS

A digit tape. 010190-123M books a DVV plate. A flipped letter rejects. No check character never pass.

replaykind —hetu —

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.