Game Shark Codes:
 

Infinite Lives-All Levels 
D00EB518 0005  


Side Scroll Levels:
Moon Jump - 800CC6FC 5080 
Invincible - 80118AD4 0055 
Infinite Smart Bombs - 8008F104 0009 

3D and Overhead Levels:

Moon Jump - D00EBF38 0040 or 800B80B4 B000 
Invincible - 800B8100 0025 
Infinite Smart Bombs On Pick-Up - D00EB51A 0001

Do not use the side scroll and 3D/Overhead 
codes together.