For info about the playable v3 release, check out rpp-backup.
Red++ serves as an updated and modernized version of Pokémon Red. It is considered the prequel to Pokémon Polished Crystal by Rangi. The version here is actually based on a heavily modified copy of Polished Crystal's engine, instead of Red Version's engine the way previous versions were.
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For stitched images of all the maps, check out the map stitches.
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For a list of features that applies to v4, check out FEATURES.md.
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For help, questions, or to generally keep up with development, check out the Lunaverse Discord.
To set up the repository, see INSTALL.md. This way you can build the latest dev version for yourself, or use it as a starting point for your own hack. It is advisable to check the main pokered repository as well for more info.
After setting up the repository, you'll want to download the current release of Polished Map++ by Rangi if you want to edit maps.