They say sharing is caring, and the current attitude of Hollywood gives Florence Nightingale a run for her money, such is the pervading spirit of generosity which sees any and every movie franchise, no matter how disparate, wanged together. You know, for artistry's sake, and not at all because lazy studios know it's a sure-fire way to extract cash from the wallets of gullible punters.
Luckily, video games have so far avoided going down the road of depressing, imagination-busting crossovers; when worlds do collide, it's strictly non-canonical. The likes of Kingdom Hearts, Namco x Capcom and Smash Bros. are, for the time-being, nothing more than throwaway fun - with absolutely no suggestion that their combined universes are in fact one, because of some contrivance or other. Long may it continue.
In fact, even when seemingly separate games do genuinely co-exist within the same narrative framework, it's handled with subtlety. You really have to dig deep to discover some of these shared virtual realities. In some cases, even the designers don't want you to know about them. We do though, so they'll just have to accept our apologies.
Benjamin was born in 1987, and is still not dead. He variously enjoys classical music, old-school adventure games (they're not dead), and walks on the beach (albeit short - asthma, you know).
He's currently trying to compile a comprehensive history of video game music, yet denies accusations that he purposefully targets niche audiences. He's often wrong about these things.