Grizzly was an unreleased game that was developed by Cor-Son Games, intended for release sometime between 2004 and 2005. It's believed that this game was based on the 1976 film of the same name, but those involved denied it.
The game would have you assume the role of a grizzly bear. You would go after and kill hunters and other animals until none remained.
The game was cancelled due to its developer filing for bankruptcy. The game was reportedly sold to Ubisoft (believed to be the game's publisher if the game was actually finished), and believed to have been converted into the game adaptation of Open Season.