Yes you need the Mario Kart Wii disk to play Wi-Fi on Mario Kart Wii. It is just like playing a normal race but with other people around the world or in your Contanent.
There is no Mario Kart 7 demo that you can play on the Nintendo eShop
There is no place on the internet to play Mario kart. It is only for the DS or DSi
There is no Mario Kart 7 demo that you can play on the Nintendo eShop
Play a Mario Kart game that has the track Yoshi Valley in it, or build your own Mario Kart
There Is Not A Demo Version Of Mario Kart, You Just Have To play it yourself
Mario Kart Wii is from Nintendo and not Playstation so no.
You need a copy of Super Mario Galaxy 1. Play it for a while ,then Play Mario Kart then it will say you have a gift From Super Mario Galaxy. then it will say you can play as Rosalina.
No
It depends on what game you have like Mario Kart for instance
No, Mario Kart 64 isn't available for DSiWare. It is, however, available for the Wii's Virtual Console.
Yes you can have two players on mario kart 7
No, Mario Kart 7 can only be played on the Nintendo 3DS