On the Title screen.... (not the main menu)


Using an xbox 360 style controller.
hold LB/RB and press the following buttons:
(Up) + (Down) + (Right) + (Left) + X + X + Y + Y

Using a Playstation controller:
hold L1/R1 and press the following buttons:
(Up), (Down), (Right), (Left), (Square), (Square), (Triangle), (Triangle)

You should hear a chime.

And everything will be unlocked!


(optional)
Just to be safe, you may want to go into the settings, and simply click 'save change' on any page.
(For example, set your region, or change your puyo style)
This will make sure the game saves.