Have any question? Quick questions -» Quick answers

[MλGNUM]

If you have any question, just post here. You'll surely have an answer.

And now, here is my question: to complete the game in Flip Mode does we have to begin a new game and delete our saved games?

[Shasharala]

Yes.  In order to play flip mode you start a new game.  All your scores and history are preserved, but the game itself starts over with the crash, but flipped.
Then you play through everything flipped.  Upon completing flipped mode, you may receive something special.