This is the repository for the Crafter-OO environment used in One Life to Learn: Inferring Symbolic World Models for Stochastic Environments from Unguided Exploration.

This repository is a fork of the original Crafter repository, modified to expose an object-oriented state and a pure transition function that operates on that state.

Installation

pip install -e ".[pygame]"

Usage

• See crafter_oo/state_export.py for the definition of the object-oriented state.
• See crafter_oo/functional_env.py for the transition function, initial state creation, and rendering the state into an image.
• You can run a game loop with the pure transition function using the run_functional_crafter.py.

Citation

@inproceedings{khan2025onelife,
  title={One Life to Learn: Inferring Symbolic World Models for Stochastic Environments from Unguided Exploration},
  author={Khan, Zaid and Prasad, Archiki and Stengel-Eskin, Elias and Cho, Jaemin and Bansal, Mohit},
  journal={arXiv preprint arXiv:2510.12088},
  year={2025}
}

@article{hafner2021crafter,
  title={Benchmarking the Spectrum of Agent Capabilities},
  author={Danijar Hafner},
  year={2021},
  journal={arXiv preprint arXiv:2109.06780},
}