Kazukis on 15 February 2011
I always considered a spin-off to be any title in a franchise that is not given the same time and effort as the main series, and/or is very different from the type(s) of gameplay that defines the franchise, and/or does not follow the same characters/story combination expected by the franchise fans.
i.e. any game that deviates significantly from the winning formula that defines the series and is expected by fans to be in titles from the main series titles of the franchise.
