Another Puzzle World
At the main menu screen that reads, "Game Start", Time Attack", and "Options", enter the following code: L-Button, up on D-pad, R-Button, and down on D-pad. This will give you access to "another world" full of new puzzles. After inputting the code, a tiny character will appear in the lower right portion of the screen. Select "game start" and when you select "Puzzle Game", it will say another world underneath it. Press A and you'll go to another world!