Cube Block is a very popular map. It is an improved version of skyblock: you will have at your disposal a small planet with various biomes, resources and dungeons. You will find three maps in the archive: standard survival, gravity edition and creative.
How to install Cube Block map
Download the archive.
Unzip its contents into the ‘saves’ folder located in the game folder.
Launch Minecraft, start a game, choosing the world Cube Block.