In ancient China, a young man was crowned at the age of twenty, marking he was adult. On the day of the celebration, all of his friends and relatives had a joyous gathering together to bless his future and enjoy interesting games. In 2021, ABU RoboCon meets his 20th birthday. Let the robots companioning with us for 20 years come and have a wonderful game! Celebrate the 20th anniversary of RoboCon! Bless RoboCon be adult, and wish young friends to work hard, to advance and to be an early success! "Throwing arrows into pots" is a traditional etiquette and game in ancient China. During the Spring/Autumn(770 BC-476 BC) and the Warring States(475 BC-221 BC) period, one of the manners of the leuds when entertaining guests is to invite guests to shoot arrows, called as "shooting rites ". At that time, the host asked the guest to shoot an arrow, and the guest could not refuse. Later, in order to enable guests who were really not good archery to participate in the game, they thrown arrows into wine pots instead, to make guests happy and practice etiquette. Over time,  it has become a kind of hospitality and elegant game during banquets. It has spread for more than 2700 years and evolved from the original ritual activities to entertainment games. Although there are many changes in the way and rules of activity, the relationship with etiquette has not been completely cut off.