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OpenAI Retro Gym hasn't been updated in years, despite being high profile enough to garner 3k stars. It doesn't even support Python 3.9, and needs old versions of setuptools and gym to get installed.
Can anything else replaced it? The best I could find is MAMEToolkit.
https://github.com/MatPoliquin/stable-retro looks to be under development. I'm still looking for docs on how to add more consoles though.
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