Preface:
I'm pulling a real Nintendo here and highlighting something that I released in September of last year, and completely whiffed Winter C3 on, and then released a patch of the scope of a "Deluxe-ification" for a few months ago. There's a big chance some of you might have heard of this game already, seen it, played it. But having spent quite a long time on it, and never having managed to showcase it here, I hope the "better late than never" reasoning works well when it comes to hoping that the content here may inspire creative levels in this completely different environment to the one I'm used to.
This SMBX2 game is the current milestone of how far the engine can go. A collaboration between Waddle, snoruntpyro and myself, with help from Sancles, rixithechao, Marina, The0x539 and Ryaa. It's 55 levels big, and hardly counts as Mario anymore.
To play it, download SMBX2b4, and insert the 2k1x Subzero Heroes folder into the "worlds" directory. Then, you will be able to select it from the launcher.
The difficulty of this gets quite intense. It was made with experienced players in mind, so you might struggle going into it.
If you prefer watching or flicking through videos of the game, there is a dev commentary playthrough we made, a walkthrough with a title I'll always find unsettling and let's play by raocow.
I hope this game manages to inspire similar out-of-left-field creations in SMW, and I hope you enjoy your time with it!