There are 3 distinct sub-challenges. Each sub-challenge is managed through its individual Codabench page---combined results will be listed on the leaderboard page here. You may participate in each separate out of domain challenge, or any combination of sub-challenges. To participate in the _shared challenge_, you must participate in all 3 with the same team name. The winner of the combined challenge will be determined by taking the smallest sum of each team's individual challenge ranking, summed over the 3 separate challenges. For example, 1st place in challenge A, 2nd in B, and 4th place in challenge C would give you a score of 7, the smallest summed score wins! We will announce the winners here, in November 2025, and invite them to the winners' ceremony at the ML Challenge workshop, which is being run adjacent to NeruIPS in San Diego on December 6th, 2025.