Competition rounds
University-level competition style math. Solve solo or with a team. We provide optional invigilation, so you aren't tempted to look a solution up or get external help. It's just you and the problems.
How a round works
- Step 1
Pick a round
A new Core round goes up every week. Sign up for the ones that suit you.
- Step 2
Set up
Laptop camera and screen recorded, phone to one side filming you and your desk.
- Step 3
Solve on paper
The problems appear for everyone at once. Work by hand, then upload your written solutions.
- Step 4
Marked by a person
A grader marks it and checks the recording. A strong result earns a badge on your profile, proof you solved it yourself.
Or solve uninvigilated, free: no cameras, and your write-up is marked after the round.
From the archive
Once a round is over, its problems and official solutions go into the archive for practice.
Join us on Discord
Talk through each problem once its round has closed, find teammates, and tell us what to build next.
More problems on the way
Make an account: Core rounds are free to sit uninvigilated.