I think you are (perhaps) mixing up things.
There is the QUASM
form to make questions, but what you want to know when you would use IT in the end of a question.QUASM
Notice that it is to form almost any
question in English.http://www.espressoenglish.net/an-easy- ... n-english/
Where´s the difference then?
With QUASM you can spot clearly the subject, I, you, he, she, it, you, we, they, etc...
But there are questions in which you don´t have clearly a subject, take questions about time and weather for example:
What time is it?
Is it the weekend yet?
Is it raining right now?
In general they may (or may not, if the answerer doesn´t wish) be answered beggining with "it´s/is"...
And there are question in which you don´t have a degree of certainty (what kind of game is this/that?) or What (kind of) game is it?
It doesn´t have a clear answer, you don´t know the game, and the other person may or may not know it.
It´s a question that leaves room to the incertainty (and a bigger answer as well), it would be "this game is" or simply "it´s bubble football game!".