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Short for backwards long jump, one of the most famous speedrunning techniques used in Super Mario 64, and is most famously used on the Looping Steps. Explaining: The final star door requires 70 Stars, but you can actually enter the door early. If you try to walk up the stairs without 70 stars, you will keep walking forever. Well, unless you turn back, in which you are right by the bottom. Because the devs forgot to cap backwards acceleration, you can repeatedly blj until you start accelerating so fast you end up at the final boss room. Just watch a video, okay? I'm not a speedrunner.
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