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.

tester-one

Honours

Highest rung each month

October 2026: Boolean Satisfiability (SAT) r07, 3-SAT r07, Independent Set r02, Clique r01, Vertex Cover r01, Graph 3-Coloring r07, Hamiltonian Cycle r03, 0-1 Integer Programming r05, Exact Cover by 3-Sets (X3C) r07, Travelling Salesperson (TSP) r01