New Super Mario Brothers movie added weekly

On the official website of New Super Mario Bros., play movies seem to be added every week until the launch. The schedule is as follows.

4/24
5/01
5/08
5/15

Already April 24th is posted on the official website, it seems that Mario which gets enormous, Mario which is minimized, Mario which is minimized, Mario which swims with the shell on the back, Mario which it swims, Fireball, Invincible state, Mario which breaks through breaking the block Yes.
New Super Mario Bros.
http://mario.nintendo.com/

Is it supposed to be said that it seems to be compatible with multiple player simultaneous play, so-called multiplayer mode?

I also saw the movie and I felt that BGM is Mario. Good old days.