0coins
Coins come from solving problems, keeping a streak, and finishing daily and weekly tasks.
The vault: Beyond the Incenter
The highest awards on this site. My olympiad geometry book, earned the slow way: Chapter 1 first, then the whole book. No code, challenge or shortcut opens these, only coins.
Titles
Wear one next to your name on the leaderboard and in your rewards. Each is named after an idea worth owning.
Themes
They re-colour the whole site and sit alongside the ones you unlock by levelling up.
Streak
Labs
Five games built on real ideas: primes, planar graphs, reflections, graph transformations and orbits. Each has a global high-score board.
Library
Papers you can unlock with coins instead of a challenge code. Yours for good once bought, on every device you sign in on.
How to earn coins
Coins are worked out from what you actually do, then banked to your account. Only the last seven days can be banked, so sign in at least once a week.