Beat the game and then return to the title screen. Now select the "Continue" option and then select "Vision Clear".
Balue's Tower (Extra Vision) bonus level:
Rescue all 72 Phantomilians.
Beat the Balue's Tower bonus game. Then on the level selection screen, a music test option will appear.
Control title screen:
At the title screen, press L2 and R2 to blow the leaves off the screen.
Game Shark Codes
Infinite Health 8010e5d00006 Infinite Keys 800be3280001 Infinite Lives8010e5ca0006
Thanks to Revolution reader Diong!