As of today, the game has an overworld. Assuming a reach (width and height of the world) of… let’s go with 8, the first 8*8 boards known to the game will be considered part of the overworld and get special handling for a literal edge condition.

Literally in that when you stand on the edge and push on, you’ll flip to a neighboring board. I could make the world a donut shape by wrapping in both directions, or keep to the original plan and add a strip of mountains to show the edges.

Right now, the overworld is plainer than an Amish wife – there’s only a screenful of random grass, recolored for the other three biomes. You can only tell you entered a new screen because the exact pattern on the ground has changed, and maybe the color. Maybe the background music, too. Step two is to add biome-specific structures like trees and rocks and such to the boards.

Thanks to the swell guys at gamedev.stackexchange.com for helping out with the shaping of the biomes.