C2C6-7F58 Infinite lives
C2C2-8DEB Don't take damage from most enemies
D0C2-848B Flashing after getting hit, lasts a long time
DAC2-848B Flashing after getting hit, lasts a real long time
For the rest of the codes, you might get trapped and have to reset
0DCA-5D5B Lighter gravity effect-Must turn off effects switch 
right after pressing Start and don't turn on until 1st game play screen
49CA-5D5B Even lighter gravity effect
F9CA-5D5B Amazingly lighter gravity effect