Using seed 5162020 gets you a crimson/corruption world. - Terraria

May 17, 2020 - Dig, fight, explore, build! Nothing is impossible in this action-packed adventure game. The world is your canvas and the ground itself is your paint.

Secret World Seeds - The Official Terraria Wiki, PDF, Wiki

The loading screen if you put in 5162020 as the world seed. : r/Terraria

Pretty sure this is a bug but it's easily the coolest world gen I've ever seen. : r/Terraria

Terraria 1.4 Special Seeds. The new Terraria 1.4 update brought…, by Daud K. Marwat

How to have Crimson and Corruption in Same World in Terraria

This Housing Is Corrupted Terraria

Terraria Map Seeds - naguide

Is my jungle save-able from this corruption? : r/Terraria

How to Get 'A Rare Realm' in Terraria - VGKAMI