CURIOSITY COUNTS

A little off.
A lot of fun.

Ballpark It is a free daily estimation game: five Fermi questions, five educated guesses. A Fermi question asks you to estimate something surprising using everyday knowledge, intuition, and rough calculations. Knowing the exact answer isn’t the point.

How to play

Each question has 25 seconds. Enter a positive number and lock it in. Need perspective? Reveal a reference for 15 points and 10 extra seconds (up to 35 seconds remaining). There is no speed bonus. The next question starts only when you choose.

Close counts

Accuracy is 100 × the smaller of guess ÷ answer and answer ÷ guess, rounded to the nearest whole point. Twice the answer or half the answer both earn 50 points. A reference subtracts 15 points, with a minimum of zero.

For accepted ranges, guesses inside the interval earn 100 accuracy points. Outside it, the nearest boundary determines accuracy. Our explanations distinguish estimates from exact definitions. Five questions means a maximum of 500 points.

A fresh five

Everyone gets the same scheduled questions, resetting at midnight Pacific Time. The reset follows daylight saving changes in that time zone. Only completed games count toward streaks. Missing a challenge date breaks your streak; yesterday’s streak stays active until today’s challenge ends. There is one official result per browser identity each day. Clearing cookies loses that identity.

Your scorecard

Share symbols use final scores: 🎯 = 100, 🟩 = 75–99, 🟨 = 40–74, 🟧 = 15–39, 🟥 = 0–14. No answers appear in shared results.