Seems like you don't know the DS library. Phantasy Star Zero isn't really one of the biggest games for the DS, but it's a good game. The DS is full of RPGs, good Puzzles, excellent Castlevanias, 2D Platformers/Sidescroller, Point and Click/Adventures, Strategy/Tactics games and other genres like rhythm (Ouendan, Eba, Rhythm Heaven etc) or simulation (Trauma Center 1 and 2, City Life, 2 SimCity games etc).
I have a list of 197 (or more, I need to update) great DS games that made me buy this little beast.
But you bought a DS and the Phantasy Star Zero game? Congratulations! Can we play together later? I am using RAmas lvl 6 or something.







