the dreamcast one and the one for PS2 are totally different. the dreamcast one involves Guts, Caska and Puck only and takes place right after the Tower of Retribution bit as they start their journey to Elfhelm. also it involves a story that wasn't in the manga.
the one for PS2, from what i could tell, also starts there but on the whole remains faithful to the manga. in fact I even saw the scene where Guts finally wears the Berserker Armor during his fight with the giant. I'm pretty sure it goes further than that.
sadly its japan only so i was wondering if anyone has it or at least knows what's it like.
yeah i know...it sucks that its japanese only. but how was the thing? was it good? and did you finish it?
right now i'm dying for the new issues of the manga to come out but I can't find them.
~The Berserker Sado-sama