Lots of people asking about the cheat code. You MUST be in the HUB Menu. You MUST click the screen first to activate the window. Then you enter the Konami Code with the ARROW keys, A & B keys and the ENTER key:

UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A, ENTER

It will unlock EVERYTHING except Lu, but will also call you out as a cheater. This will disqualify you from the contest to submit your own custom challenge to be put in the Hall of Fame in Chaos Mode.