Not really vaporware but
I would've killed for this to come to the US. The customization (is that a word) would've equated to many many replay hours. The 64DD coming to the US probably would've hurt Nintendo more than helping them though so

. Still, watch some of the videos there. They had me salivating all over again.
[edit: I found the above (again) while looking through IGNs list of N64 games to build up my wish list. While searching I found this review --
click here -- which has moved to the number one slot in my 'top ten funniest reviews' list, beating out
Gravity Games: Dirt Vert Bert Girt etc for Xbox.]