I don't think Disgaea counts as a buried treasure there, Lix.
That said, this list needs a heaping dosage of
I'm not kidding, either. It's an underwater action game that involves you using your sonar to track enemies. It's not particularily complicated or deep, but it's good solid fun. I got it because I was at a friend's house and they had it, and they didn't really like it, so they just gave it to me.
It's surprisingly decent and I recommend it to people who are looking for something a little bit different. Not a lot of games feature underwater combat anymore.
Jam it back in, in the dark.