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Mappet is a Minecraft mod (for 1.12.2 exclusively) that is designed as a tool set for far superior adventure maps than possible with vanilla. It's also possible to use Mappet for scripted roleplays, and, to some extent, in Minecraft machinimas.
Special thanks to Andruxioid for the mod's name, Jvonlins, Centryfuga and CustomNPCs Forever Vkontakte group for testing, suggestions and directing!
Install Minecraft Forge, download the latest stable version of jar file for available Minecraft version. Also install following mods: McLib, Metamorph, and Blockbuster. Put it in minecraft's mods folder, and launch the game.
Optionally, to use JavaScript, you need to download the Javet (38 MB) library and put it in the mods folder
After that, Mappet mod should be installed and will appear in Minecraft's mods menu. If Mappet didn't appear in the mods menu, then something went wrong.
At the moment, the mod is still in development, however, here is a playlist of videos that cover some Mappet mod's features:
clickable
Alternatively, there is an almost complete wiki describing all Mappet's mechanics. If you'll have questions about the mod, you can also join Mappet's Discord server.