A trailer for the latest installment in the popular Nintendo minigame series, Mario Party 9, has just been released. One major change in this edition is that all players will now move around the board together at the same time. Another change is the addition of boss fights at the end of each stage. The game will release in North America on March 11th, 2012 , in the UK on March 2nd, and in Japan on April 26th. Check out the video after the break.