A game belonging to multiple series

[Dazz]

Well, ultimately the Crash and Spyro games can be listed seperately, because they aren't actually the exact same game. Battle Toads & Double Dragon was a Battletoads game, and Street Fighter x Mega Man I would list as a Mega Man game, since you play as him, and it is less about the Street Fighter characters and more about Mega Man.

Those are my personal thoughts. But ultimately, you can just list them as the game titles.