Another World in Arcade Mode
At the original title screen, press Triangle,
Left, Right, Left, Triangle. A small character
will appear on the bottom left side of the
screen. Then, go into Puzzle Mode and
choose Arcade to access a new set of
puzzles.
Submitted by BigHead

Bonus Characters
To gain access to five new characters, beat
Story mode in Player vs. Computer mode.
Doing this gets you Madam Luna and Dreg.

After that, play Win Contest mode until you
fight a new character. Beat them, and they
are yours!
Submitted by Eddy Gordo