Review for NeurIPS paper: Emergent Complexity and Zero-shot Transfer via Unsupervised Environment Design

This paper pursues a significant line of enquiry regarding an important topic: automatic, unsupervised environment design. The paper makes algorithmic, theoretical, and empirical contributions. While the reviewers had some concerns about the clarity of the theory and the adequacy of the empirical results, these have been well addressed in the rebuttal. The authors are strongly urged to incorporate all the reviewers' feedback in the final version.