I'm a bit confused about using the correct preposition in the following sentences. 

Which one sounds correct ?
"on the Google play store" or " in the Google play store " 

What about the following examples ?

search on/in the Google ...
Or 
Find it in/on the Google

I searched on/in the google it seemes people use them both.

Is it correct to say "You can search the google play store or You can find it in the google play store / It's in the google play store." And "You can find it on google play."

Does "in" sounds better to you with "the" and "on" sounds better without it?

in that example would you only say "in the" with "store" and "on" without "store"?