5 questions a day. Guess the number — scored by how close you get.
Come back tomorrow for 5 new questions.
Closest Wins is a daily estimation game built around one simple idea: you don't need the exact answer — you just need to be closer than yesterday. Five questions per day cover everything from human biology and geography to history and technology. You're scored not on whether you're right, but on how close you are. A 2% miss earns 100 points. A 40% miss earns 30. Maximum score is 500.
The concept of collective estimation became famous through Francis Galton's 1906 experiment at a county fair, where he discovered that the median guess of 800 attendees estimating an ox's weight was within 1% of the actual number. This "wisdom of crowds" effect shows that human estimation, when untethered from exact recall, is surprisingly powerful. Closest Wins taps into that same instinct — rewarding calibrated thinking over rote memorisation.
You receive 5 questions per day. For each question, type your best numerical estimate and submit. After each answer, you'll see how close you were, the actual answer, and a brief fact explaining the figure. Questions are date-seeded — everyone in the world plays the same five questions each day, making it easy to compare scores with friends.
Numerical estimation — also called number sense — is one of the strongest predictors of overall mathematical ability, according to research from Johns Hopkins University. Regularly practising estimation sharpens your capacity to reason under uncertainty, spot unreasonable numbers in real life (like a suspiciously cheap quote or an inflated statistic), and build stronger intuition about the physical world. It's a practical skill that benefits everyone from students to financial decision-makers.