The terrain gen should support mountains that seem actually big. If infinite terrain is added, this shouldnt be too difficult. Basically: Dont limit the game world within some height range. If the amount of terrain over 'bedrock' is limited, lift the bedrock to make mountains. I dont care, just gimme mountains. What mountains should be like: Big (as in have to use 10 real world hours to reach top with medieval equipment, including camping a few times along the way and maybe having to backtrack and take the other route) Interesting (should have caves and winding passages and cliffs and more level locations where trees could grow and such) Challenging (fast winds, low temperatures, snow, fog/clouds) Beautiful (should pierce the clouds, should look pretty from distance like in intro vids of ME) Should have nice view from top Should allow making mountain fortress (from resources point of view) without too frequent trips back down Landmark visible from anywhere Volcanoes would be cool too, you can copy meteor storm system straight from SE lol What mountains should not be like: Slippery impossible to climb giant cones (mountain ranges instead of single mountains also!) Not visible due to stuff being unloaded from RAM when you walk 100m (=keep very low level of detail data in RAM and render it even if mountain is a few km away) Big piles of useless rock 100 m high hills you can walk around in 5 mins (it should be a real achievement to cross one, or even get up to see whats on the other side) For implementation, the world on a high level could be represented by a heightmap with biome data. This is what would be used to render the mountains from afar (the low level of detail version). Actual terrain would be generated when you get nearer. Voxel terrain would get generated at the level of the heightmap at that point (the surface of the world). This is assuming that a pure voxel based solution wouldnt be able to generate really far away terrain features cheaply which it might be able to do (not sure). The point of the game should be to set up a base on top of a 5 km mountain and engineer sleds + a ski lift. Then youll make big profit selling people tickets.