What is the rarest game you own?

[Ostro]

I don't really know what's rare and what's not. I guess these games might have a shot at "my rarest game":
Dreamcast (JP):
Eternal Arcadia Limited Box [new]
Ikaruga [sealed]
Orange Pocket Limited Edition [new]

NES:
Wrecking Crew (most awesome Mario game lol)

I'm more into rare (limited) hardware =/