The competitive platform for mathematics

Master mathematics,
one problem at a time.

Solve thousands of problems across five difficulty tiers — from basic algebra to IMO-level challenges — with instant symbolic validation and a roadmap that grows with you.

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CollegeCalculusHard

Symbolic engine · accepts equivalent forms

Your answer

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Fractions, radicals, and equivalent forms all work.

16k+

Curated problems

Roadmap topics

Difficulty tiers

Learning tracks

Five difficulty tiers

Every problem is rated relative to its education stage. Harder tiers multiply your points.

Easy

×1 points

Medium

×1.8 points

Hard

×3 points

Very Hard

×4.5 points

Impossible

×6.5 points

Everything you need to level up

Structured roadmaps

A 55-topic dependency graph from arithmetic to IMO problem solving. Pick the Middle School, High School, or College track and follow a path that adapts to what you already know.

Smart validation

Symbolic + numeric checking accepts every equivalent form — 1/2, 0.5, or √4/4 all count.

Problem map

Explore the full library by stage and difficulty — find gaps and competition pools.

Timed mock exams

Generate AMC, SAT, or AIME practice tests with a real exam timer and a full score report at the end.

Theory center

Deep-dive articles with worked examples, common mistakes, and linked practice.

Gamified progression

Earn ELO-weighted points, climb from Novice to Legend, and keep your streak alive.

Weak spot analysis

The engine watches your attempts and pinpoints exactly which topics are slipping.

Ready to climb the ranks?

Free to start — daily practice, the full problem library, and community solutions. Premium unlocks theory, hints, and mock exams for $4.99/mo.

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Master mathematics,one problem at a time.