There are lots of variations of playing this game.

A simple version is to have the children standing in a circle and take turn in greeting the person next to them according to the traditions of different countries.

England - Handshake

France - kissing both cheeks and saying "Bonjour"

India - hold hands together, bow and say "Namaste"

Innuit - rub noses

Russia - bear hug

Do some research to find others to add, this provides opportunities to find out more about cultural differences.