Here are some cheats and tips for the game Shinobi 2: The Silent Fury.
Secret bonus:
Complete a round without opening any boxes that contained bombs to
collect 3,000 points.
Passwords:
Enter one of the following passwords to begin game play with the
corresponding effect.
Effect Password
Yellow, Pink, Green, and Blue Ninja D09F9
All Blue Ninjas and Yellow Crystals 1FEF1
All Ninjas and Yellow Crystal 11817
All Ninjas; Yellow and Pink Crystals B9B12
All Ninjas; Yellow, Pink, and Blue Crystals DDE91
Final level 1FEDF