This is a game originally made by Unomuroku. I edited his powerpoint to make some visual improvements, to simplify it and to make it accessible to all grammar points for all JHS grades.
What you will need:
A tv, whiteboards for every group, a dice to give to every group and a sheet of paper with the questions you want to ask the students (In this post I'll link lesson 1-5 questions for grade 7's and 9's)
How it works:
Go through the slides until you get to the rules.
Explain to the students that you or your JTE will ask them a question and that the groups that get the correct answer will be able to choose a prefecture to take.
Explain that once a prefecture is taken the students can only take prefectures adjacent to that prefecture.
Explain that students can take each other's prefectures and that to do so they'll have to choose to either play janken or roll dice for it.
Go through the slides until you reach the map of Japan now assign teams. There are 4 different teams/colours in the ppt. Choose one group per colour and have those groups choose friend groups who will be part of the same team. (You can splits them into 3 teams if that fits better with the amount of groups your class makes)
Demonstrate the whole process with the help of your JTE by saying you got a maru answer and now you can choose a prefecture and click on one prefecture, now sensei gets a maru answer and chooses the same prefecture so they will need to play janken or roll a dice to take it from you.
Start the game.
Write the category of question and the question on the board and then read it out loud to the students.
Give students 2 minutes per question and feel free to give them hints as they think about their answers.
Once time is up walk around with the JTE and mark the student's answers with a maru or batsu.
Ask who the maru answer groups are and then have every group with the correct answer choose a prefecture one by one. I chose the maru groups that could select prefectures randomly every round.
Give double point rounds where groups with the correct answer will be able to select 2 prefectures to keep the game interesting.
Prefecture selection should happen per correct/maru group and not one selection per team, if 2 groups within a team get the right answer then they should both get an individual chance to choose a prefecture.
Tell students to use their textbooks for assisstance, the goal is to build their confidence with using their previously learned grammar whilst still testing them.
When there's about 5 mins left in the class, count up the prefectures taken by each team with your JTE and then announce the winning team.