In the Apple II game "Below The Root", was a side-scrolling RPG kind of like early Zelda games, and you could use the floppy drive to wall-hack.
Every time you walked from one screen to another, it would load the new screen from disk. If you removed the disk from the drive before walking to a new screen, it would grind the empty drive for a while, but eventually it would just use the old screen layout for the new screen but still "think" you were in the new tile.
So lets say you had 3 screens 1-2-3 and '2' has an obstacle but '1' does not. You could:
1) walk to the right hand edge of screen 1
2) remove the floppy
3) cross to screen 2 - this would appear to reset you to the left side of screen 1
4) put the floppy back in
5) walk to right side of the "fake" screen 1 and cross to the next screen again
6) presto - you're now on screen 3! Obstacle avoided!
And you could repeat step (3) multiple times to teleport across an arbitrary # of screens.
Every time you walked from one screen to another, it would load the new screen from disk. If you removed the disk from the drive before walking to a new screen, it would grind the empty drive for a while, but eventually it would just use the old screen layout for the new screen but still "think" you were in the new tile.
So lets say you had 3 screens 1-2-3 and '2' has an obstacle but '1' does not. You could:
1) walk to the right hand edge of screen 1
2) remove the floppy
3) cross to screen 2 - this would appear to reset you to the left side of screen 1
4) put the floppy back in
5) walk to right side of the "fake" screen 1 and cross to the next screen again
6) presto - you're now on screen 3! Obstacle avoided!
And you could repeat step (3) multiple times to teleport across an arbitrary # of screens.
8 y.o. me was super proud to figure that out :)