You can either download a pre-made world or create your own: How To Make a One Chunk World in Minecraft (Easy Tutorial)
Defeat the Ender Dragon on a tiny platform in a one-chunk End dimension. One Chunk Minecraft Map
Instead of traveling horizontally, you mine deep to find hidden villages, abandoned mines, or strongholds buried directly beneath you. 2. How to Get Started You can either download a pre-made world or
Survival turns into a puzzle. Every block is valuable; for instance, you might have to combine dirt and gravel (renewable via bartering) to expand your soil. One Chunk Minecraft Map