Jan-Ken is a traditional Japanese hand game often referred to as rock-paper-scissors. It is played by two participants who simultaneously form one of three shapes with their hands: a fist (rock), an open hand (paper), or two fingers (scissors). The game is simple and quick, with each shape defeating one of the others: rock crushes scissors, scissors cut paper, and paper covers rock. This game is commonly used to make decisions, settle disputes, or choose who goes first in various activities. Jan-Ken is not only popular in Japan but has also gained recognition worldwide, often serving as a fun and engaging way to resolve conflicts.