I wanted to build an OGame Death Star model in Minecraft, and I started doing it on the highest mountain I could find, for some reason... I built one third of it and blam, can't build any further! Why is that? Or is that a bug?
The Minecraft world is 256 blocks (as of Minecraft 1.2) from top to bottom. The reason for the height restriction is that the Minecraft world is made of 16x16x256 'chunks'. These are loaded into memory and rendered starting with the ones closest to the player. A 3D world of chunks (where the world is 'infinite' vertically as well as horizontally) is a whole lot more complex than a 2D world of chunks to manage, and optimizing for smooth gameplay would be a challenge. 256 is a convenient number that's a power of 2 (making it align nicely in memory).
Note that there is also a separate build height on servers. In the
Although it is theoretically possible for a mod to increase the height limit of the map, I can't find any that work with the current version of Minecraft or are in active development.
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The height in unmodded Minecraft is restricted. From the bottom of the world to the highest possible point is 256 meters, or blocks.