Those amazing games no one knows about.

[Mutsukki]

Agreed for Gitaroo Man up there and I don't really know the others, except Shin Megami Tensei, that's ultra popular =P (even more because of Persona)

I wish more people knew about this fun new Nintendo IP from a while back called Kiki Trick. It's a "casual" game and Japanese only, but it has really interesting concepts:



It has a bunch of different minigames, this is just one of my favorites~