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What's the difference?

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All stages · Demo 372

Paraguay RUC

Choice ruc / vat / other. Eight digits; 11→0, 10→1. Jev never mods 11. Seven digits need 8.

ChoiceRUC 2–9 in JS

A digit tape. 80012345 books a SET plate. A last-digit flip rejects. Seven digits never pass.

replaykind —ruc —

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.