Fermi: Günlük Tahmin Oyunu

Fermi is a guessing game that tests your general knowledge and logic with seven new questions every day. The questions are about numbers you don't know the answer to by heart, but can approach by reasoning: "How many people in Türkiye are named Mehmet?" or "How many ships passed through the Bosphorus in 2025?" You only have one guess per question; the rest is mental calculation, napkin math, and a little intuition.

Now you can play with your friends too: duel, form groups, practice on different topics.

HOW TO PLAY
• Seven new questions are published every morning at 10:00 AM (Turkish time): from everyday life, places and history, science, and numbers. • Write your guess and lock it. You cannot change it once locked. • Each question is worth 100 points: 100 points for a perfect answer, 85 points for double or half the answer, and 50 points for ten times the answer. Estimating more or less counts the same. • Today's score is the average of seven questions.

BEHIND EVERY ANSWER
• Napkin count: See step-by-step how you might approach the answer. • Source: Answers are based on official statistics and reliable sources; the source is written under each question. • Scatter chart: See where your guess falls among other players.

PLAY WITH FRIENDS
• Add friends: Search by username, share your invitation link, or scan the QR code. • Duel: The same 5 questions for both of you, 40 seconds per question. Your duel score increases as you win. • Open duel: Challenge anyone or join someone else's duel. • Groups: Create groups with your family, school, or workplace; compare your daily, weekly, and monthly scores in the same table. • Your friends' scores for today will be revealed when you play; the surprise is not spoiled.

SUBJECT TRAINING
Science, history, sports, economics, food, transportation, nature, technology, and more. Choose a topic and practice with 5-question rounds.

PROGRESS, COMPARE, SHARE
• Take your place on the daily leaderboard.
• Play every day, grow your streak, collect badges.
• Your profile shows your average, streak, and strongest topics from the last 14 days.
• Share your daily result as a card or emoji summary.

SMALL BUT USEFUL
• Built-in calculator and scrapbook
• Easily write large numbers with × thousand, × million, × billion shortcuts
• All past puzzles are archived
• Optional daily reminder
• Light and dark themes

ACCOUNT OPTIONAL
You can play the daily puzzle without creating an account. For friend, duel, and group features, you log in with your Google account or a one-time code sent to your email; no password required. Once logged in, your games sync with fermi.tr and the iPhone app.

FERMI PRO (OPTIONAL)
Daily puzzles, duels, and groups are free for everyone. The free plan allows you to play 3 duels and 2 training rounds per day, and create a group of up to 10 people. Fermi Pro offers unlimited duels and training, groups of up to 100 people, group history, and detailed statistics. Monthly or annual subscription; new subscribers get a 7-day free trial with the annual plan. You can cancel your subscription at any time in the Payments & Subscriptions section on Google Play. It connects to your Pro account; also valid on the web and iPhone. Terms of use: https://fermi.tr/kosullar

PRIVACY AND SECURITY
No ads, we don't sell your data. Profile photos are reviewed before publication; you can block or report any player you want. You can delete your account from the app at any time. Details: https://fermi.tr/gizlilik

If you like quizzes, brain games, and number puzzles, try Fermi. The same games are also available online: fermi.tr