It is a free online calculus game. A problem appears, you type the answer, and it is either right or it is not. No multiple choice to guess your way through, no hints, no partial credit for effort.
An asymptote is a line a curve gets closer and closer to and never actually touches. That is the whole idea. There is no final level, no ending, no point where you have finished. You just get closer.
5 minutes on a clock. Mechanical problems only, nothing that should take you more than about 25 seconds. Your score is how many you got. Difficulty climbs as you go and stops at 7.
A strong student lands 12 to 15. Be honest about which one you are.
No clock, three strikes. The difficulty climbs every three problems up to d20, and your score is the deepest one you actually solved, not the deepest one you saw. Reach d20 and it's overtime: the strikes become a 15-minute clock, every right answer buys a little time back and every wrong one costs a minute. How many you solve there is the ×13 in “d20 ×13”.
This is the only place titles come from.
Both modes end after 3 strikes. You do not need an account to play either of them.
There is no secret format to guess. It reads LaTeX, plain text and most things in between, then checks your answer numerically rather than by string matching, so any correct form of the answer is correct.
All of these are accepted
Things that will not cost you
And there are keys for the characters your phone buries three taps deep:
One problem a day, and everybody in the world gets the same one. No timer, no strikes. The XP drops with every wrong attempt, from 250 down to 175 and then 125, so first try is the only try that really counts.
It also keeps your streak alive, which is the cheapest possible way to not lose one. New problem at midnight UTC. It needs an account, because it pays real XP.
Beside it on the Daily is today's curve: one graph, the same for everyone, and six guesses to name its function. Either one keeps your streak.
Go and do today'sBeyond Sprint and Diverge there is a little more to do. On a phone it is all in the menu (the three lines, top right); on a computer, along the top or on the Play page.
Half of the Daily: a graph a day. Name its function in six guesses, then share your grid.
Drills the exact rules you keep getting wrong, from your own mistakes. Needs an account.
Each week you are put in a group of ten. Finish near the top and you go up a league.
Everything you play earns coins, and coins are never sold. Spend them on packs of creatures - 36 to collect. Your score is your Area Under the Curve.
Finish a Sprint and send the challenge link: your friend gets exactly the same problems.
Teacher put a code on the screen? Go to /join. Teaching? Open /teach to host a live game for the class.
Everything you do pays XP. Every level costs exactly 4,000 XP, and it never gets more expensive. The 400th level costs what the 1st did.
Where XP comes from
Where XP does not come from
Money. There is no XP pack, no boost, and no subscriber multiplier. The number next to your name means exactly the same thing whoever is wearing it, and it is going to stay that way.
Your badge changes colour and symbol every 100 levels. The symbols are the maths itself, climbing from arithmetic to calculus:
Level 1,000 is a moving gradient and an infinity sign. Nobody has one.
Five of them, all from ranked Diverge, all permanent once earned. They show next to your name in the top ten of a board, or anywhere at all if you hold a Founding Pass.
They sit under your name on every leaderboard. None can be taken away once earned. These close forever: the first 100 accounts (Charter, already gone), the 1,000 Founding Passes (Founder), the first 100 of those (Axiom), and Pioneer, for the first 100 people to reach level 5.
Play on a day and your streak goes up. Miss one and it goes back to zero, which is the entire mechanism. Days run midnight to midnight UTC, and the daily problem is the cheapest way to keep one alive.
You will also see the person immediately above you on XP, and exactly how far behind you are. Not the person at the top, the person you could pass tonight.
Free, permanently
The Pass
See the Pass →
That is everything.
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