There are 4 different game modes to choose from.
Low difficulty with a simple score system. For beginners and those looking for a fun, casual experience.
The basic mode, high difficulty. For players who enjoy battle and earning high scores.
Very high difficulty, energy accumulates easily. For players who aren't phased by overwhelming battles. Adjusted to earn ranks faster than Original Mode.
Lower difficulty than Casual Mode, shots are more powerful. Players who don't normally enjoy shooters should begin here.