Study a painting briefly, then restore its nine pieces. Earn Impeccable by placing every piece correctly on the first try. Enjoy the finished artwork and a little of its history. A free daily browser puzzle with Mona Lisa practice.
Fermi
Three daily estimation questions from different categories.
What is Fermi?
Fermi is a daily puzzle game that challenges you to estimate hard-to-know numbers using quick math and intuition. Each day brings three questions from different categories, and your goal is to get as close to the real answer as possible. It's inspired by the Fermi estimation technique popularized by physicist Enrico Fermi.
How to play Fermi
You'll see a question like 'How many iPhones have been produced since 2007?' and enter your best guess. After locking in your answer, the real number is revealed and you're scored based on how far off you were, as a multiple of the correct answer. You can use the built-in calculator while guessing, and your daily score is the average of your three guesses.
Tips & strategy
- Break the problem into smaller parts and estimate each one.
- Use rough numbers and round to make calculations easier.
- Think about the scale: is it thousands, millions, billions?
- Don't overthink; your first instinct is often close.
- Use the calculator for quick arithmetic, but avoid searching for exact figures.
Frequently asked questions
Is Fermi free?
Yes, it's free to play.
How often does a new puzzle appear?
A new puzzle is published every day at midnight ET.
Can I play old puzzles?
Yes, the full archive of past puzzles is available in the side menu.
How is scoring calculated?
You're scored on the multiple of the real answer; lower is better. Your daily score is the average of your three guesses.
Can I submit my own question ideas?
Absolutely. Use the 'Submit a question' link in the menu to send an idea. The more information about the question's source and answer, the better.
Where to play
Play Fermifermi.gg · free, new puzzle daily
Keep your curiosity going
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