C2Chunk

Rather than keeping a full vertical stack from bedrock to sky in memory, the game loads only the cubes near the player. Builders can raise skyscrapers and dig bottomless abysses past the vanilla height limits, and the default world height can be changed freely. Because the cube structure cuts memory use at extreme heights, the mod is meant for building and exploring far up or down with minimal impact on performance.

Client and server both need the mod, so every player on a server that runs it must install it too. Files are published for Fabric and NeoForge across 15 release versions, 1.20 – 1.21.11. The mod is licensed as All rights reserved, so it is not open source. Because the change reshapes world generation and chunk layout, the author suggests creating a fresh world and keeping backup saves before adding or updating experimental world-generation mods.