The People's Democratic Republic of Spackmanistan

Tuesday, September 16, 2025

Mario 64 B3313

B3313 or Build 3313 (also called SM64 Internal Plexus) is a ROM Hack of Super Mario 64 developed by Chrisbrutalagresion and his team. It is the largest beta-based SM64 hack to date, especially regarding the number of accessible areas, star count and various other aspects. The final version has been released here

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The hack is based around the myths surrounding Peach's Castle and unused content from the original game that have been discovered over the years, resulting in an unsettling sprawling maze where doors, pipes and teleports can lead the player into completely unexpected locations. In short, this basically turns the hack into the SM64 equivalent of Yume Nikki; a massive, surreal maze where nearly every room leads to somewhere else, a single room can be reached from multiple areas, and there is little in the way of hints to guide you. The 15 courses are also not cleanly divided between each other; instead, each course is made up of several mini-courses that can be in completely different areas of the castle. This all combines to create a disorienting experience. Version 0.9 onward also has the Personalization A.I. truly live up to its title as it will modify the difficulty in some areas depending on vague actions, and 0.9 also introduces several new mechanics such as the Red Stars, new coin types, and an In-Universe Game Clock that can change certain locations and events to confuse the player even more.

As for the plot, it initially seems to be nonexistent — you are immediately dropped into the castle without even a hint of Bowser kidnapping Peach, though you nevertheless have to find all the Power Stars to rescue her as usual. But as you venture through the castle walls, you may begin to discover the scattered pieces of a story involving the Personalization AI...

Several of its areas are lifted from many web series about the SM64 Personalization phenomenon, such as the Super Mario 64: CLASSIFIED series.