Super Smash Bros. x Kingdom Hearts: Heroes Unite

Kingdom Smash Bros.: Seekers of Light is a crossover video game in The Kingdom Smash Bros. series.

Summary
The borders between worlds have become blurred as a particular un-named franchise has grown overly complicated. Now it's bleeding into other realms, leaving Pit and the lost characters of Nintendo to deal with the increasing problem of the Heartless. But will finding a Keyblade really solve matters?