THE SHORT VERSION
What is Cifra?
Five real-world questions arrive each day with no multiple choice: type a number and see how close it lands. Scoring compares proportional error, shorthand such as 9m and 1.2bn works, and every revealed answer includes its source. Everyone gets the same five questions at midnight ET, followed by a shareable result grid; the bilingual pool contains more than 650 questions across 13 categories.
A focused browser puzzle with an easy-to-read central rule.
Why it made the list: Cifra turns estimation into a short research-backed ritual, with a shareable result grid and a source attached to every revealed figure.
BEFORE YOU OPEN IT
What to expect
- 01
A rule or interaction you can understand without a long setup.
- 02
A first attempt that teaches you what a better second attempt should look like.
- 03
A compact challenge suited to a short browser session.
OPENS THE OFFICIAL SITE
Start Cifra in your browser
Cifra is hosted on its own website. The button opens cifragame.com in a new tab.
KEEP EXPLORING
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