B3313 (Super Mario 64 Internal Plexus)
A sprawling Super Mario 64 hack built around the idea of a lost beta cartridge, with a maze-like castle and far more than 120 stars.
What it is
B3313, short for Build 3313, pretends to be an unreleased development build of Super Mario 64. It draws on early beta material, cut ideas and fan legends about the game, and grows them into an eerie, ever-shifting castle with many original areas and a star count well past the usual 120.
Two versions
The project split into two lines that are both still around. Version 1.0.2 (Hotfix 3) is ChrisRLillo's continuation, with extra content of its own. The A2 Anniversary Edition is maintained by Chlorobyte's team and is built to run on a real Nintendo 64 as well as on emulators. Both were updated in July 2025.
Playing it
The creators' page has a web patcher that applies either version to your own Super Mario 64 (US) ROM, plus older builds tweaked to run on more setups. The patched game is very large (about 96 MB), so some emulators need extra settings; the page explains what to change.
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