If you want to be the best read the following.
All Games: Input UP, DOWN, UP, DOWN, L1, L2, L1, L2 at game selection.
Extra Tracks in Boogie Down: Get the high score in the game to unlock extra songs to boogie to.
Easy Win: Cover the camera's lens with your hand.
Easily beat Wishi-Washi on hard mode: Walk left and right in hard mode to wash more windows and a high score.
I hope that my cheats help you and I will keep you updated with the latest releases.