Students are divided into teams, preferably six. Each team nominates a leader, and on their turn the leader comes to the blackboard.
They say the name of a Japanese prefecture, such as Hyogo. They then have thirty seconds (or a full minute for first years) to come up with a word that starts with each letter of the prefecture. For example, Hello You Orange Great October. No repeats, and the words must have at least three letters.
If they complete the challenge, their team gains points equal to the number of letters used in total, and ownership of the prefecture. (The example would receive 26 points.)
Future teams can challenge that ownership, and in that case representatives from both teams race to complete the word. The points earned by the fastest team are subtracted from the losing teams points and given to the winners.