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The memory skill alone is impressive as fuck.
I've played this game a million times, but that "wall jump" he does at 4:34 I'll never figure out. Thats the part that always gets me like, how the fuck did you figure that out? It's not a game play mechanic.
Some horizontal speed towards the wall (facing right: X speed > 16, facing left: X speed < 240)
Mario's feet must hit the wall exactly at a block boundary (every 16 pixels)
Some luck to make Mario go into the wall a little bit (at least for 1 pixel)
It's possible to perform walljump from any non-lethal solid material (bricks, pipes, etc.)