> Some mags will make you invincible when you get to 1-10HP in battle (like ANGEL'S WINGS and Bana).  There's an easy way to "activate mags".  While playing on Ragol, hold the R-trigger and press the Y button, then push R-trigger (if necessary) to access your Techniques list.  Change the order so that "Resta" is the first one, and "Reverser" is the last one.  Now you're ready to unleash the Force on your teammates. 

> Hold the R-trigger and press the Y button, then press UP+A simultaneously while on your Techniques list.  This might take a little practice to get the timing down.  Once you learn this, you can use it to "activate" your teammate's mag by reducing him/her to 1HP.

> While playing online with friends just plug another Sega made controller into the Dreamcast.  Using that controller, hold L+R and press Up/Down to toggle the view between your team members.

> It's tedious enough to get a Mag to Level 200 with full Synchro and IQ.  After that, every time you begin a game, your Mag's Synchro goes down a little -- which means you have to feed it even more!  Well, your Mag's Synchro will never go down if you just put it in the bank before each quit and save, or exit to lobby!

> Just put the Phantasy Star Online Ver.2 GD-ROM into a CD-ROM drive, then access the "Extra" directory for a bunch of picture files.
Note: tested with the Japanese and American releases.

> Hate those pesky traps that make you crawl?  Whenever you enter a room or hallway just press Start and proceed to run right by all the traps without slowing down!

> Hate those CaveMine/Ruin rooms with the lights out?  Whenever you enter a dark room just press Start and proceed to run right by all the enemies (towards the light switch) without slowing down!

> Using a keyboard, type "URAENDING" at the title screen to go directly to the ending sequence.

> While playing on Ragol, hold the R-trigger and press the Y button, then push R-trigger (if necessary) to access your Techniques list.  Change the order so that "Resta" is the first one, and "Grants" or "Gizonde" is the last one.  Now you're ready to unleash the Force on your teammates. 

> To hit your teammates with Grants/Gizonde, just hold the R-trigger and press the Y button, then press UP+A simultaneously while on your Techniques list.  This might take a little practice to get the timing down.  Once you learn this, you can use it to charge your teammate's PB, or possibly annoy him/her.