Phantasy Star Online

Phantasy Star Online cheat codes: 
Character movements:
Hold [Alt] and press [F1] through [F12] to make your character
perform various movements.

Turn off pop-up info palette:
Use this trick to turn off the big palette that appears every time
you encounter a monster. Hold [Space] during game play. A green
cursor will appear in the lower-left side of the screen. This does
several things. Whenever you encounter a monster, the lower-left
side of the screen will always be clear, This also frees up more of
the screen so you can see more monsters appearing from other
directions. Release [Space] when you want to chat. This is useful
when playing as short characters.