What is the 400-year-old Patthar Ka Khel ritual held after Diwali in Shimla?

What is the yearold Patthar Ka Khel ritual held after Diwali in Shimla

What is the 400-year-old Patthar Ka Khel ritual held after Diwali in Shimla?
What is the yearold Patthar Ka Khel ritual held after Diwali in Shimla