They just added New Dimensions to Minecraft (1.16 Snapshot Update 20w21a)

Here's a look at the NEW custom dimensions added to Minecraft 1.16. You can now add your own custom worlds and dimensions! This is awesome!PLAY Block Ness Mo

Custom Dimension Minecraft Data Pack

Everything new in the Minecraft 1.16 snapshot 20w06a : r/Minecraft

Snapshot 20W21A - Minecraft 1.16 Nether Update - Number 16! Custom

Java Edition 23w13a_or_b – Minecraft Wiki

Et tu, Brute? Snapshot 20w27a is out! : r/Minecraft

Minecraft 20w21a Snapshot - Custom Worlds & Dimensions Added

Minecraft 1.16 Snapshot 20w06a Nether Biomes, Netherite (Stronger

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Java Edition 20w14∞ – Minecraft Wiki

Java Edition 21w20a – Minecraft Wiki

Custom Dimension Minecraft Data Pack