CrossWorlds I'd say has a more broad age range.
Sonic Rumble Party is about toy-versions of characters running through plastic versions of stages.
Yes, they are toys, but it's same with Super Smash Bros then, and yet SSB's still all-ages game.
Satoru Iwata explained that the battles in SSB do not represent real Nintendo characters fighting each other, but rather an imaginary battle among toys.
This was originally decided to resolve internal debates about whether it was appropriate for icons like Mario to punch Pikachu.

