Or upload a custom one: Upload or drop an image here. ⚔️ multiplayer 🗡️ single player 🔑 my account ☰ game menu Webin this video, you'll learn how to create your very own custom maps in territorial. io! I'll guide you through the entire process of map making in this exciti. Webhow to create a custom map on territorial. io!mapchart: In the main menu, select singleplayer, then press the custom button to choose an image file,.