Math SprintSurvival
Start with a minute. Every correct answer adds three seconds, every wrong one costs five. It ends when you do.
Play against a friend
Make a room, send them the link, and race the same questions at the same time.
This race is Survival — everyone plays that mode's rules.
One minute, as many correct answers as you can manage. It opens with two-digit addition and subtraction, moves into multiplication once you have a few right, and then mixes everything together — so the questions you face at forty seconds are not the ones you faced at five.
Every question is generated when you reach it rather than pulled from a stored list, which means a second run is genuinely a second run. You cannot memorise your way to a better number, and there is nothing to look up.
It is built for a thumb. The keypad sits low on the screen where your hand already is, a wrong answer clears immediately rather than stopping you to explain itself, and the next question is already there. If you are on a laptop, the number keys and Enter do the same job.
How it works
- Sixty seconds on the clock, starting from the first question.
- Type your answer on the keypad or with your keyboard, then submit — Enter works too.
- Difficulty steps up as your correct answers accumulate: addition and subtraction first, then multiplication, then both.
- At the end you get how many you got right, your accuracy, and your fastest single answer.
Common questions
- How does the difficulty increase?
- It steps up as your correct answers accumulate rather than as the clock runs down, so the run adapts to you. It opens with two-digit addition and subtraction, brings in multiplication after the first few land, and then mixes all of them with larger operands. Someone answering quickly will see harder questions at the thirty-second mark than someone taking their time — which is the point, since a fixed difficulty curve is either too easy at the end or too hard at the start.
- Why is there no percentile, like "top 8%"?
- Because we would have to invent it. The Board of Fame shows the best runs anyone has chosen to save, not a record of everyone who has ever played — most runs are never saved at all, so there is no real population to place you within. Plenty of sites show a percentile anyway. We would rather give you your own previous number to beat, which is the only comparison that was ever real.
- Can I use a keyboard instead of the keypad?
- Yes. Number keys type digits, Enter submits, Backspace deletes the last digit, and Escape clears the field. The on-screen keypad and the keyboard stay in sync, so you can switch between them mid-run without losing anything. The whole test is completable without a mouse.
- What happens if I get one wrong?
- It counts against your accuracy and the next question appears immediately. There is no penalty beyond the seconds you spent, and nothing stops to tell you off — a modal explaining your mistake would cost you more time than the mistake did. Your accuracy figure at the end is what tells you whether you were pushing too hard.
- Is my score saved?
- No. Nothing is written to your device and nothing is sent to us; close the tab and the run is gone. If you want to keep a result, the share button encodes the numbers into a link you can copy — that link is made in your browser and goes only where you send it.
This measures arithmetic speed under time pressure on one particular run, which is a narrower thing than it feels like while you are doing it. Tiredness, the hand you are holding your phone in, and whether you have done this before all move the number more than anything about you does. The Board of Fame is shared with everyone who plays, but it only ever shows the best ten runs anyone chose to save — not a full ranking of everyone who has played.
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