Door Hurdling OOB

Jumping over a staircase to get out of bounds.

Door Hurdling Boss

Jumping over a staircase to get into the Wall boss room early.

Door Hurdling (a.k.a. Stair Hurdling, Gate Hurdling, Door Jumping, etc.) is a glitch where Young jumps over a door tile that is near the edge of the screen and causes the screen to scroll without Young triggering the door transition. This is only known to be possible in two places: jumping over the two endpoints of the staircase that leads down to the lowest level of the Mountain Cave dungeon.