TGDB.NET - Mario's Picross cheats
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Change background on Super Game Boy
 Enter one of the following codes during game play to change the background to
 match the corresponding Game Boy case colors. You MUST be using a Super Game
 Boy:

 Hold START               Green
 Hold RIGHT + START       Red
 Hold UP + START          Black
 Hold DOWN + START        White
 Hold LEFT + START        Yellow


Change to the transparent Game Boy
 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.

Cheats by Felipe Gerhard - felipe.gerhardgmx.net