>>714839397It's a custom world made on the Super Mario Bros X PC engine that people used to use before romhacking got advanced enough to sidestep the need for its existence.
Betterified VI: Bestified (don't play the other 5 sub-par inside joke hacks before it) is ostensibly a comedy-based custom world that shows off a bunch of SMBX's custom asset tools. However, it's also jam-fucking-packed with more secrets than you could ever believe actually exist within the game. Secret worlds and bosses, religion mechanics, bad/true endings, esoteric multi-step secrets with debug keyboard commands that almost always end up paying off in the form of something mildly silly. It goes deep beyond belief.
It's not kaizo difficulty either, it's pretty casual-friendly (as a casual myself), though the game does nothing to stop you from using base-game SMBX cheats.
Here's a download link;
https://www.smbxgame.com/forums/viewtopic.php?t=29122
And here's the release trailer;
https://youtu.be/uWw2SSdcHWs?si=vO6EnYOO6M7ZdxP-
Also Super Mario Bros X was made by Redigit, the main man behind Terraria, which is why the fireball sprites look exactly like a Terraria spell.
The Harpy King is REAL.