So we know how to make terrain, and we know how to make grids. Getting from one terrain to another is easy, just put the two regions right next to each other. Connecting terrain to a grid or a grid to a grid is a little more complicated. For that, we need to use portals. Portals are essentially just doors from one region to another. Another way to move the player character around is to teleport to a specific point via a teleport trigger.