Ok this is pretty simple. What you do is say something about you then the next person says if that a similarity between them or not and then also says a new similarities. Here is an example:
Person1:I have a dog
Person2:I do not have a dog, I have cats
Person3:I have cats too, i love chocolates
We start with : I like cookies! =)
Person1:I have a dog
Person2:I do not have a dog, I have cats
Person3:I have cats too, i love chocolates
We start with : I like cookies! =)
