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The World Landscape symbol chosen for an Age determines which terrain generator builds it. Each Age is its own dimension.
| World Type | Behavior |
|---|---|
| Standard World | Uses the Overworld terrain generator. |
| Cave World | Uses the Nether terrain generator, but still creates a flat top layer where the Nether ceiling would be. It does not automatically include soul sand, gravel, or glowstone. |
| Island World | A single floating island (slightly smaller than the main End island), optionally surrounded by an infinite ocean of a chosen liquid, or floating in midair with "No Seas." |
| Flat World | A flat Age whose height equals the average height of its biomes; land below sea level is covered by the chosen sea material. |
| Void World | An empty Age except for a 5x5 spawn platform and any features used; accepts no terrain or sea block modifiers. Still can contain structures that do not need terrain. Extremely dangerous without a flight ability, but the ultimate blank canvas. |
| Amplified World | Uses the Overworld Amplified generator for a vastly exaggerated heightmap. |
Biome behavior can shift inside Ages. The Hell biome generates with a Stone base by default and does not impose the Nether's no-water/no-bed rules. Ocean and other aquatic biomes generate water only where they sit below Y 63. The Sky biome also defaults to a Stone base, and if the biome at coordinates 0,0 is Sky, the Ender Dragon may spawn. Mushroom Island biomes are topped with mycelium and block hostile mob spawns. Surface decoration and vegetation only generate when the world's base material is Stone.
