Beat all normal stages in puzzle mode to unlock the hard puzzles in 1P puzzle mode.
Beat the special puzzles to unlock mania mode in 1P puzzle mode.
Beat the hard puzzles to unlock the special puzzles in 1P puzzle mode.
Press B to skip through the credits.
OK, so you want some exclusive sprites to play with? Well, go to Help on the menu, and select Download Corner. Now I'm not telling what they are!