Video Game spinoffs aren't actually as common as you might think. Sure, games have tons of sequels, but those don't really count, and mashups like Marvel vs. Capcom or Super Smash Bros. are in a category of their own. To be a spinoff, a game has to be totally separate from the main series, with a totally separate story or set of mechanics that is still somehow related to the original line. Since the majority of the game-playing populace out there reacts negatively when their favorite franchise's formula is altered, most of these games fail. However, there are still some spinoff gems out there that have gone down as great games in their own right.