All stages · Demo 356

Russian INN

Choice inn / tmp / other. Ten digits; (sum%11)%10. Jev never mods 11. Nine digits need 10.

ChoiceINN 2-4-10 in JS

A digit tape. 1234567894 books an FNS plate. A last-digit flip rejects. Nine digits never pass.

replaykind —inn —

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.