I am AMAZED at the depth of this game.
AMAZED.
Nintendo outdid themselves.
How So? I haven't played it.
Sorry I didn't respond to this, I spaced it.
There are a whole bunch of individual game modes. The adventure mode on this game (kind of a side-scrolling platform thing) is much more advanced than in the other games. There are a TON of levels to play on, and there are a bunch that have really cool concepts, like on the Wario Ware level, you do whatever the game tells you to do, like hiding under an umbrella or dodging something trying to smash you, and if you do, you become bigger or invincible or something. Also, there is a place where you can design your own levels, which you can share with your friends to play on them. You can take pictures or replay videos of every match, which you can also save.
Also, there is a lot more co-op than the previous games, the adventure mode I was talking about is co-op capable, and all of the events have a co-op version. Then all the stadium events are co-op capable. Also, there's a bunch of new characters, and they only got rid of a few originals who were redundant (no mew 2, no roy, no dr, mario, etc).
So yeah I like it, good times.