This is a level editor for They Are Billions. It works by uploading a save file, making changes to the save file, and then loading that save file into the game. You can change the terrain, modify objects, and build custom gamemodes by editing the waves. Take a look in the tutorials section for a link to the level editor.

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They Are Billions - Dev VLogs & Link

They Are Billions - Dev VLogs & Link

Mapping/Technical Tutorial

A link to the actual level editor which can be used in a web browser.