Best Multiplayer Games

I've recently been looking for a good game that can be played by many players - online or offline. I especially love the graphics and concept of this one. It's not just a game that can be played by many players, but there are also quite many games to choose from! Each game also has instructions and a level of difficulty before you proceed to the game itself. I haven't told my friends yet, but I'm sure they'll love it too.