A training ground for students and enthusiasts to learn and compete.
Robols Math is for mathletes preparing for local, regional and international competitions, and for enthusiasts who simply enjoy the problems. Established in 2019, it has grown into a small global community known for sharing challenging problems and working through the solutions together.
This site is a revival of — and a considerable improvement on — a website Robols used to run. The objectives are unchanged: share problems, discuss solutions with the community, and learn together. Where the older version was limited, this one makes contributing far easier: problems come from Robols and from solvers who propose their own, and each one is reviewed before it is published.
Each category has its own colour, used consistently everywhere — the bar beside a problem, its tag, your mastery chart, your activity feed. The bar's height shows difficulty; its colour shows the category. Brass is reserved for rating and rank, and never means anything else.
Both you and every problem carry a rating on the same scale, starting at 1000. Each problem you take on counts as a single game between the two of you: solve it and you win, abandon it and the problem does.
Problem ratings are recalibrated daily, from the difficulty ratings the community submits and from measured signals such as solving time and number of attempts. A problem's rating is ultimately measured against the average of the system.
Your own rating is recalibrated daily too, from the ratings of the problems you have solved or forfeited. Beating a problem rated near you moves your number meaningfully; beating one far below you barely registers, while losing to it costs a great deal.
Rating says where you stand relative to other solvers; XP says how much you've done. Rating can fall — XP only accumulates.
Every problem carries a difficulty from 1 to 10, and XP scales super-linearly with it: a difficulty-10 problem is worth roughly thirty times a difficulty-1 one.
Three multipliers adjust the XP a problem awards: the number of attempts you took, your solving time, and your current problem streak.
Solving earns badges — twenty-six of them, covering volume, mastery of each category, rating, speed and contribution to the archive. Most come in five tiers, so The Committed marks ten problems solved at tier I and five thousand at tier V.
They are worked out from your record rather than stored, so a badge always matches the figures beside it. Your profile shows the ones you have earned; the full list of badges shows every one and what it takes.
Robols Math has been posting problems and solutions since 2019. Come and say hello.
What we collect. Account details you give us — name, email, and optionally birthday, gender, country and what kind of solver you are — plus your solving activity and anything you submit through Contribute.
What is public. Your username, country, rating, XP and profile picture appear on the leaderboard and beside your comments. Your email, full name, birthday and gender are never shown to other users.
What we use it for. Calculating your rating and leaderboard position, recommending practice, and improving problem calibration from aggregate solve data.
What we don't do. We don't sell personal data, and we don't share it with advertisers.
Your control. You can edit your profile at any time from the Profile page, including clearing any optional field.
This is the short version. The full Privacy Policy sets out exactly what is collected, who processes it, how long it is kept and how to have it removed.
Using Robols Math means agreeing to the Terms and Conditions — how accounts work, what is expected in discussions, what happens to problems you contribute, and how moderation and bans are handled.