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What's the difference?

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All stages · Demo 138

Leap year

Choice birth / fiscal / copyright. Leap is `y%4===0 && (y%100!==0 || y%400===0)`. 1900 is a common year even if it “feels round.”

ChoiceGregorian leap in code

A giant year. Magenta subtitle says leap or common.

replaykind —year —

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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.