Super Mario 64 BLJ (Backwards Long Jump)

This takes us back to the good ol days 1996. Back when Super Mario 64 came out. But not long after somebody figured out how to literally go through anything, it is called the BLJ.

How to do it so you need to have a slope go backwards hold the Z button hold back the joystick and mash the A button but just to know this takes lots of practice.