Video game music mashups

Several of you are probably familiar with SiIvaGunner, the youtuber who uploads video game music except it’s the Flintstones theme song or something.While they can be funny, they’re not exactly the type of thing I’d want to add to my music library. However, I randomly stumbled across this video of his:

This mashup of the themes from Skyward Sword and Fire Emblem: Fates works incredibly well. Anyone else have any amazing video game music mashups they can share? Can be from SiIvaGunner or somewhere else.