Celes and the others are looking for rest of the groap, and I just found Shadow and Gau from Veldt. I returned to Thamasa, and Shadow was gone. One guy there told that he went to place called Colosseum, so cause it's my only clue, I guess I'm suppose to go there. But, the case is, at least I don't remember place like that, plus the new world map confuses me, so I'm now travelling around the world still not finding it. I'm pretty sure I've been everywhere for about 20 times...

So, I need help. Where is that 'Colosseum?????????'

It up in the top-right hand corner of the world map. I looks like the Opera House. Also it's by Daryl's Tomb and Nikeah. That all that I can think of to help you hope it helps. :D

For first find the stryker(inside the cave of the Veldt)then bet it at the colosseum and after the fight against shadow(easyyyyy)he'll join you.