In both Korea and Japan, there is this ladder which is like a 'game' where it can help one randomly choose something as it goes up the ladder. What is this called and how does it work?
The game is called "Climbing the Ladder" [사다리 타기], and it is used exactly as you described -- to help random choice. This is how it works. Suppose you want to choose what to have for lunch -- sandwich, tacos, pizza or Korean BBQ. With four choices, you draw four vertical lines, like so:
Now, randomly add the "rungs" to the ladders, like so:
With the rungs, pick a ladder to climb. Climb down by making a turn at every rung -- like so:
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