Final Fantasy 15 just released today on Xbox One and PS4, and a great Redditor has already discovered a hilarious reference to Kingdom Hearts.
Though video games are often more fun when shared with friends, developers tend to have a hard time with sharing their ideas with others. They've gotten better at it over time, especially in Japan, but it's still pretty uncommon to see franchises cross over into each other. When they do, however, people tend to get excited, as big businesses put aside their differences to deliver a fan's dream match-ups or team ups. Here are the 10 best crossovers, team ups, and special guest stars in video games.