Hidden Artwork:
     To  access  the  hidden artwork, insert the Phantasy Star CD into
your  PC  CD-ROM and go to the Extras directory. Inside the folder you
will find various images.

Unlock Hard and Very Hard Mode:
     Finish  the  single-player  version of the game (offline version)
and  you will unlock Hard and Very Hard mode. You will get more XP and
better items playing the game in these modes.

PB recharger:
     This only works online and recharges PB for your friends not for
you.
1 Put RESTA in R menu (in customize)
2 Put GRABTS or ZONDE or GIZONDE in L menu.
3 Press R button (for short time), you will see your target selected
(blue cursor). Then press as fast as you can GRANTS or GIZONDE or
RAZONDE in your L menu ( dont use RESTA). You will hit your friend,
and up his PB. (depends on DFP) 

Recharge TP:
     Go to TECHNIQUES, select HEAL. Select RESTA, PRESS SIMULTANEOUSLY
RESTA  + Up button. This will recharge all TP of your friends, but not
yours.

Hidden costumes:
     The  following  passwords  are entered into the "charatcter name"
field to unlock two hidden costumes for that character.

Fomarl: DNEAOHUHEK
Fonewearl: XSYGSSHEOH
Fonewm: ASUEBHEBUI
Hucast: RUUHANGBRT
Humar: KSKAUDONSU
Hunewearl: MOEUEOSRHUN
Racaseal: NUDNAFJOOH
Racast: MEIAUGHYSN
Ramar: SOUDEGMKSG