So I have seen this in many Wikis ( most prominently in the Pokémon Wiki) and this wiki seems a bit empty without that game. So therefore I present you, the Wizarding World atlas...

This is a game in which one says a word, a name, a spell, an item, a book, a character from the Wizarding World

Eg: Grindelwald

Then, the next person will give his word. But the word will be starting with the last letter of the last word

Eg: Player one: Grindelwald

Player two: ( Grindelwald ends with D) Diffindo

Player three: ( Diffindo ends with O) Occulumency

And so on

There is no order for players. Anyone can continue the game

Suppose two people are playing

Player 1. Harry Potter

Player 2. Ron Weasley

Player 3: Yaxley

Any player can join in between

So I start with A

Avada Kedavra

So now the first reply should say a word with A ( Avada Kedavra ends with A)