Free to play  ·  New puzzles daily

Games for people who think in numbers

Estimation puzzles, timeline challenges, and number detective games. Rewards intuition over memorization.

Play today's Fermi Browse all games
3 games available
Daily puzzles
Free forever
Daily puzzle ·
How many cups of coffee are consumed worldwide every day?
Fermi · Medium · Be the first to play
Take a guess
--:--:--
until next puzzle

All games

🎯
Popular
Fermi
Estimate a big number. How many golf balls fit in a school bus? How many cups of coffee does the world drink daily? Get as close as you can.
8 questions Medium
Play Fermi →
🔍
New
The Impostor
Four numbers, one is completely made up. Find the fake before you run out of attempts — each wrong guess costs you points.
6 rounds Hard
Play Impostor →
📅
New
Timeline
Drag 5 events onto a timeline in chronological order — oldest to newest. Themed rounds: tech, space, pop culture, history.
4 rounds Medium
Play Timeline →
⛓️
Soon
Chain
Higher or lower, but it never stops. How long can you keep your streak alive?
Coming soon Easy
🗺️
Soon
Map It
A number floats in. Pin it to the country it belongs to — GDP, population, life expectancy.
Coming soon Hard
📈
Soon
Trending
A mystery Google Trends chart appears. Was this peak fidget spinner or peak NFTs?
Coming soon Medium

How it works

1
Pick a game
Three games live now, more dropping soon. Each one tests a different kind of number sense.
2
Trust your gut
No googling needed. The best players use intuition and estimation, not memorized facts.
3
See how you did
Every round ends with the real answer and an explanation of the math behind it.
4
Share your score
Copy your result card and send it. Challenge your friends to beat you.