Here's an interesting one.
This book has a bit of mystry to it, so you can expect higher prices when you do find it. It's also flimsier then the others with no hard cover or decent spine. (more like a thick pamphlet) This makes it somewhat easier to ruin or bend, so be careful when buying.
As you can see, this is a Sonic X-Treme book, but it was not named for the now-infamous failed game. Likely it's just because "x-treme" was cool. Predictably, Sonic is doing something 'xtreeme' on the cover, which seems to be boarding while wearing a backpack. The art is some shadowed neon, so you can't really "check out Sonic's new look" unless you actually open it up and look inside.

The plot has nothing to do with the X-Treme game that was never released. It's another "Archie Comics" like plot, where Robotnik kidnapps Bunny Rabbot. He then challenges Sonic to "X-Treme" events like climbing and bungie jumping. (very odd). While Sonic & Robotnik are somehow having an x-treme sports contest, Sally & Rotor work out a way to save Bunnie Rabbot themselves, because they think/know that Robotnik will not likely honor his deal if Sonic wins. (Of course, they get her back, and Sonic wins) But is there any interior art? What is the fake new look? This is another Titlebaum, but by TROLL books this time. Plot supplied by: Sonicandtails26