Japan, Muromachi period

Fourteenth- to sixteenth-century Japan. Feudal lords, samurai, and a surprisingly clever party game.

The original form was called Amida-kuji (阿弥陀籤). Amida is short for Amitabha, a Buddha whose iconic halo radiates lines outward in all directions from a central point. The earliest version looked exactly like that halo: lines fanning out from a centre. Pick a line, follow it, see where it ends.

No grid, no horizontal connectors. Just a circle and a result at the end of each line.

The grid changes everything

At some point, someone added horizontal connectors between the vertical lines. This changed the game completely. Now the outcome was a path, not a single jump. You started at the top, hit a horizontal bar, switched to the next line, kept going, hit another, switched again. The result looks random to the eye but is completely fixed once the grid is drawn.

The most important property: every starting point leads to a different ending point. No two players ever land on the same result. The game is fair by construction.

Hidden connectors

The next innovation was simple but decisive: draw the vertical lines and the destinations first, then hide the connectors. Each player chose a starting position without being able to see the path.

Why does this matter? Because if the connectors are visible, a clever player can work out which path leads where and choose accordingly. Hiding them restores the randomness. The grid decides, and no one can argue.

The grid was fair by design rather than by trust, which mattered in a setting where reputation was at stake.

Crossing East Asia

As the game spread, each culture renamed it.

In Korea it became 사다리타기, literally "ladder climbing", capturing the climb down the grid. In China it became 鬼脚图 (Guijiaotu), "ghost-leg diagram", from the eerie way the horizontal connectors look like legs. Same game, three names.

Digital ladders

Drawing lots digitised easily as a simple random pick. The ladder game was a harder problem online, because the path itself matters. You cannot just pick a random number; you have to simulate the path.

Korean apps and websites rebuilt the whole grid digitally: generate the vertical lines, place the connectors at random, animate the descent. Users still feel the tension of watching their line travel down. Without the path, the ladder game would be an ordinary random pick.

On Korean television

The ladder game has been a fixture of Korean variety television for decades. On 1박 2일 (Two Days One Night), members regularly draw a ladder to decide who sleeps outside or who gets the comfortable room. Running Man uses it to assign teams and stakes within a single episode. Infinite Challenge built entire segments around watching the cast trace their lines down a giant ladder drawn on a studio whiteboard. The format is appealing on screen because the result is visibly fair, visibly slow, and visibly nobody's choice — exactly the qualities a variety show wants when the outcome involves someone losing something.

The common thread

Drawing lots gives you a verdict at once. The ladder game gives you a verdict, but makes you walk every step of the way to find it. Both are fair. Both have been used for centuries because people need to believe the outcome was not arranged.

A Buddha's halo became a medieval party game, then a system used across East Asia every day.