Easy Mode
Failing a mission more than four times will unlock easy mode.


EX mode:
Successfully complete the game to unlock the EX mode option. This option 
allows you to play the game again with the money available at the end of 
your last game, and unlocks new items.


Money:
Complete the game, and you will start a new game with all of the money from 
your last game. 


G-Squad mode:
Repeatedly fail a mission to unlock the G-Squad mode option, which 
allows the game to be played under an easier difficulty setting.


Defeating the first Boss 
Use your tracking system (press R). Keep shooting until he goes to 
somewhere else. Shuffle until you track him again and repeat this process 
until it he is defeated.


Defeating the final Boss 
Have at least two Medixir items, the Leviathan 3, and Vulcan 3 barrels. Use L so you can sway from left to right, keeping the monster in your 
screen. Take the Boss' HP all the way down until he has only a little 
remaining. Use the Leviathan 3 to do this, then use the Vulcan 3 for the 
finishing touch. You will probably have to use at least one Medixir before 
this point. Make sure you do not use the other. Wait until you die to use it. 
Do not use any Neo-Psionics to fight him; only use Cure 2 and 3 on 
yourself.