DBBE-446F Start with 10 lives
D1BE-446F Start with 7 lives
D0BE-446F Start with 5 lives
DDBE-446F Start with 1 life
C2B9-3404 Infinite lives
D6BE-47AF Start with less energy
4DBE-47AF Start with more energy
C2B9-1FF7 Infinite energy
6DB5-CD97 Most enemies are defeated with one shot
23BD-3F07 Start with all weapons and all enemies defeated--Except Sigma
C9B3-4769 Infinite weapons once you have them

Sometimes jumps will go back to normal
D08A-1FBC Bogus jump
D58A-1FBC Super jump
DB8A-1FBC Mega-jump
DDB0-4FA1 Disable weapon charging
DDB1-4F61 Weapon charges to 1st power level faster