Zoggle is a daily estimation game. Every day at midnight Eastern, three new questions go up — things like how many golf balls fit inside a school bus, or how many cups of coffee Americans drink in a day. You get one guess at each. No multiple choice, no hints, no second attempt.
You are not supposed to know the answers. That is the entire design. What the game measures is whether you can reason your way from things you already know to a number you have never seen, and how badly you miss when you try.
Type whatever you can defend, in whatever form is easiest — 250k, 2.5 million and 2.5e6 are all read the same way. There is a calculator and a scratch pad built in for when the arithmetic gets away from you.
Good estimates are almost never one guess. They are several small guesses multiplied together. A school bus is roughly 35 feet long; a golf ball is about an inch and a half across; everything after that is arithmetic you could do on the back of a receipt.
Every reveal shows the real figure, the reasoning that gets you there, and the source it came from. The reasoning matters more than the answer — it is the part you keep.
Guesses are scored by ratio, not by difference. Your number divided by the real one, or the real one divided by yours — whichever is larger. Guessing 40,000 when the answer is 20,000 scores exactly the same as guessing 10,000, because both are 2× away.
Your score for the day is the geometric mean of the three, which is the honest way to average ratios. One catastrophic miss drags the average down the way it should, and three near-misses average out to a near-miss rather than flattering you.
The skill has a name. Physicists call these Fermi problems, after Enrico Fermi, who was known for producing startlingly good numbers from almost no data — most famously estimating the yield of the first atomic bomb by dropping scraps of paper and watching how far the blast wave carried them.
It is more useful than it sounds. Most numbers arrive without context: a headline statistic, a startup's projection, a contractor's quote, a claim someone makes in an argument. Being able to work out roughly what the answer should be is the cheapest lie detector there is. You do not need to be right. You need to notice when something is off by a factor of a thousand.
No. Everything here is multiplication and division, and there is a calculator one tap away. Choosing sensible things to multiply matters far more than doing the multiplying well.
Nothing stops you. It just makes the game pointless — there is no leaderboard to climb and nobody to beat except yesterday's version of yourself.
Midnight Eastern, every day. Once you have finished, the results screen counts down to the next one.
Yes — every past puzzle stays playable in the archive, and playing an old one never affects your streak.
Public sources: government statistics, industry bodies and published research, each one cited on the reveal. Real-world figures get revised and sometimes disagree between reputable authorities, so treat them as best-available rather than final. Since the game scores by order of magnitude, a little drift changes nothing.
No. There is no sign-up and no email. Your streak and history are stored in your own browser and never sent anywhere.
Estimation is a learnable skill rather than a knack. The guides cover the fundamentals: the four-step method, the piano tuner problem worked through, the anchor numbers worth memorising, and the six ways estimates go wrong.