Here is what each value does: seed: determines the seed. Different seeds mean the map looks different. min-height: determines how low the height can go. Must be lower than max-height max-height: determines how high the height can go. Must be higher than min-height Hill frequency: determines the width of the hills; lower frequency means wider hills hill-freqstep: determines how different seeds are from each other. If this is kept high, changing seeds even the slightest can change the map a lot. Flatness: determines how flat the terrain is; higher flatness means flatter terrain, and lower means spikier terrain. Use the left and right arrow keys to move; the map is infinite, as all values are calculated with a seed.