Eragon was/is a in my eys VERY underrated game ! It had a open Overworld, a skill system a 3rd person view, it was just great, but I sadly already played it through so I won't have any motivation to play it again
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Anyway Hopefully Way in the Dusk, Tales of Innocence and Kingdom Hearts 358/2 Days will keep me busy, cause they seem to shape up pretty nicely, I love Adventure Games since Eragon (I even played The Legend of zelda - The ocarina of time cause of it ^^)
BTW: More Underrated games:
Gba: Payback, Zone of the Enders, Banjo Kazooie
NDS: Nanostray, Brothers in Arms DS, Pirates of the Caribbean 2 (though 3 sucked in my opinion)
Whoops... i should start reading topic tiles more carefully... only DS huh ? Well I think no one will argue about those Gba Titles I listed, or ?