Fast math. Play it your way.
Solve problems against the clock, chase a growing streak, and spend what you earn on power-ups that change how a run feels. Free, no account needed, and built to be genuinely accessible — screen readers included.
Play NowSprint
60 seconds on the clock. Answer as many problems as you can before time runs out.
Endless
No timer — but every mistake costs a life, and you only get three.
Survival
Starts at just 30 seconds. Correct answers buy you more time; mistakes cost it immediately.
Daily Challenge
One try a day, with the same problems for every player, so your score is directly comparable.
Focus
No timer, no lives. Pick one operation and practice as long as you like.
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New modes, new achievements, and anything else worth knowing about.
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Built to last
- Difficulty that ramps up right when you're ready for it
- A clean interface that feels great on your phone, tablet, or desktop
- A full set of achievements worth chasing, with hidden ones to discover
- Feedback that actually shapes what ships next