Source: YouTube

ASSEMbler Wrote:This is a video of the concept "nights" version of Sonic Xtreme for Sega
Saturn. Looking to produce a concept for a 3D sonic, a Sega USA team
used the nights engine to produce a concept for demonstration. Upon
hearing about the use of their engine, the Japanese team had a fit and
forced the adoption of a different engine, the so called "fish eye" version
that was later canceled as unworkable.

This bickering lead to the cancellation of the only "Killer App" for Sega Saturn.

This video is from the only copy of the game in existence, which sold for
nearly $3000 in 2006.

Awesome!!! I want one!!!  Nights was such a cool game IMO - I had a special edition "Christmas" version, but I doubt it was as valuable as this game   Man, $3,000!?! You could buy 75 slaves for that!!!