GameZone have reviewed Demon Stone. Here's a snip:

If you’re ever read a Forgotten Realms book the name R. A. Salvatore will most certainly ring a bell. He has written dozens of fantasy novels and is the best at his craft. He also just so happens to have penned the story for this game. Demon Stone’s story tells the tale of a fighter named Rannek, a sorcerer named Illius and a female half-breed rogue called Zhai that meet in the kingdom of Damara during a massive battle against evil orcs that invaded the peaceful land. Thrown together by fate, the three take shelter in a mine only to witness the rebirth of two demon rivals long since vanquished by a human wizard named Blackstaff while the pair was battling each another. Now with dangerous foes reawakened and with both demons vowing to fight for who will enslave and rule the realm, the three become the chosen heroes to save the realm by fighting the demons and their hordes.

Read the whole thing (http://ps2.gamezone.com/gzreviews/r23562.htm) at GameZone.