This is a fork of the Arcade Learning Environment (ALE). It is mostly backwards compatible with ALE and it also supports certain games with 2 and 4 players.
To install it in Python, please use pip install multi-agent-ale-py
@article{terry2020multiplayer,
title={Multiplayer support for the arcade learning environment},
author={Terry, J K and Black, Benjamin and Santos, Luis},
journal={arXiv preprint arXiv:2009.09341},
year={2020}
}