Force Server Connection
If you hit the Play button and you notice that the server is down or set to "Busy," you can force a connection anyway by entering the following key sequence: UP, DOWN, LEFT, RIGHT, UP, UP, DOWN, DOWN. You may still experience issues once you connect, though, since the server likely didn't offer that notice on a whim.
Tips and Tricks
Play the Game When the Server Is Down
At the very first screen, before the login screen, enter this code: UP, DOWN, LEFT, RIGHT, UP, UP, DOWN, DOWN. You can now play the game when the server is down or busy.