“World” in the game (LEGO Worlds) is the term for generated stages from where you play the game, build your structures, play-through, and wander around to find all the different stuff to copy, re-create, or collect to complete your Quests. Each world is unique, and generated from a basic make-up of biome, or a collection of Biomes, and are saved based on their defined Galactic Coordinates (for when you want to revisit them later on in the game).
Generating a World
The game automatically generates the first 3 worlds (as tutorial stages), where the player would presumably learn and earn the different tools needed to play the game. During the tutorial phase, the game will sequence different activities that makes-up the very pattern of tasks found in the game (which you’ll have to participate in) in order to progress.
After the tutorial phase however, you'll start to generate your own world based on the preference you enter into the "Galactic Coordinates" field of your ship's navigation menu, or alternatively through random find of a world. Once a galactic address is entered, the player can preview their world with a small 3D map that rotates. If you would want to proceed with this world, simply pick the option to "Go to World" which will then load the World, and set your ship en-route the given coordinates.
In LEGO Worlds there are 5 sizes of different worlds. The smallest ones, similar to the ones in the tutorial phase of the game, are represented with a 1x1 block on the World Map. The largest are the Huge Worlds, represented by a 6x6 block.
World sizes and Unlock requirements:
Tutorial Worlds, 1x1 on the map, unlocked by default
Small worlds, 2x2 on the map, unlocked upon obtaining 10 Gold Bricks
Medium Worlds, 3x3 on the map, unlocked upon obtaining 25 Gold Bricks
Large Worlds, 4x4 on the map, unlocked upon obtaining 50 Gold Bricks
Huge Worlds, 6x6 on the map, unlocked upon obtaining 80 Gold Bricks