In previous reviews, they mention 6 floors. I was there yesterday and let me just say they've added 3 more to the building. I'll mention some other things about store. I love the fact that you never have to go outside to get inside. In August, in Tokyo, that's a plus in my book. Anything electronic is represented on some level (pun intended). The 9th floor is everything golf related including clothing and gear. The 3rd floor is nice because it is all about kids and video games and there is a good size arcade for kids to play on. They actually have 3 Dragon Ball Hero machines. Why do I care? I don't but I have a son who does and he was going to Hakuhinkan in the Ginza to play and they only have 1 and there was always a que. The emplyee are terrific and helpful.
I definitely agree that you could easily spend a whole day just looking/shopping through the building. It's definitely 1-stop shop and easy to access.