Beta release. Problem Forge is new and open by invitation. The beta test period runs through 2026-11-30; the full opening is on 2026-12-01 00:00 UTC. Things may break, and we may correct the boards when they do. The difficulty of some rungs may be wrong. There are no prizes during the beta, and the bounty is not open. Your account and your progress stay when the beta ends. Please tell us what goes well and what goes wrong: admin@problemforge.com.

Support From

Problem Forge is supported by its climbers and sponsors. Sponsors will be thanked here. No payment changes progress, ranking or any bounty.

A professional tier (being explored)

We are exploring a professional tier.

Professionals would be encouraged to pay US$200 a month or US$2,000 a year; educators US$10 a month or US$100 a year. You choose which applies to you; nothing is checked.

Its only benefit is knowing that you help the site keep running and last longer. It changes nothing about progress, rankings, Firsts or bounties. It is not a donation to a charity and is not tax-deductible. There is no way to pay yet.