When does Night of the Werehog from Sonic Unleashed come out?

"Night of the Werehog" is not a standalone release. It's a portion of the game Sonic Unleashed, which was released on November 18, 2008 in North America.

The "Night of the Werehog" levels occur when Sonic transforms into a werehog after the events of the game's opening sequence. It's a key part of Sonic Unleashed's gameplay, and it's not something you can play separately.