Old Customized – Minecraft Wiki

Customized, retroactively labelled Old Customized by later game versions, was a world type that replaced the normal varied terrain of the Overworld with custom features. Because, as of snapshot 18w06a, it was removed completely due to the rewrite of the world generation, it was then replaced by a new, easy-to-customize but considerably more limited substitute world type called Buffet. Custom worlds returned in 20w21a, though they are completely different; this version also renamed this world typ

Old Customized – Minecraft Wiki

Nether Reactor – Minecraft Wiki

What are world types in Minecraft?

Old Customized – Minecraft Wiki

Minecraft 1.20 Trails and Tales Patch Notes - Minecraft Guide - IGN

Old Customized – Minecraft Wiki

Crafting Table – Minecraft Wiki

Altitude – Minecraft Wiki

Old Customized – Minecraft Wiki

Legacy Console Edition – Minecraft Wiki

Old – Minecraft Wiki

Gear – Minecraft Wiki

Custom – Minecraft Wiki

Pocket Edition v0.16.0 alpha – Minecraft Wiki