Phantasy Star Online 2 cheats and cheat codes for Dreamcast

Serial number delete
Load the game, after select "Dressing Room". Press the power button on
your Dreamcast system. Turn on the system again and load back your
character. The game will ask you to re-type your access key and
serial number. No one can find you with your card.
Your disconnects and wins in battle mode will be gone.

Secret message:
There are letters on the red weapons. When they are put together in order:
HeathCliff

Red Saber: He
Red Sword: a
Red Dagger : t
Red Partisan: h
Red Slicer: Cl
Red Handgun: i
Red Mechgun: ff


Rename weapons in game:
Finish the challenge mode and reach "S-Rank"

Watch the ending
You need a Dreamcast keyboard to type the following cheat codes.
Go to the title screen, and type "URAENDING".