They call it "Spider Wars on the Wall ".
I don't know how to call this in Japanese, because we created this play in our own right.
It is like a ball tag.
The rule is simple. You have to stay in the soccer field or steeps. Oni has to throw ball to others.
Kids really enjoy that I have been "IT/Oni".
To be honest..... I feel guilty every time they slide on the dirt steep with their pants. I did fail to control them about this..... But I have suggested kids to stay inside the classroom when it was showering, but the answer was "NO". They call the shower "Oregon Sunshine". Really?
I have learned it...