Super Game Boy colors:
Note: This code requires that this game is used with a Super Game Boy cartridge in a Super NES console. Enter one of the following codes during game play to change the background to match the corresponding Game Boy case colors.

Code	Color
Hold Start	Green
Hold Right + Start	Red
Hold Up + Start	Black
Hold Down + Start	White
Hold Left + Start	Yellow

To change to the transparent Game Boy, sweep the D-pad continually in a Full-Circle until a tone is heard. Hold the D-pad in that direction and press Start.

Deleted saved data:
Highlight a saved data file, then hold A + B + Select to display an option to delete that file.

Time trial mode:
Successfully complete all the puzzles in Picross mode.