I've seen a few classic video game mash-ups before, like the brilliant Pong vs. Asteroids (okay I just made that up), but found many of them lacking. Mega Man vs. Ghosts 'n Goblins, however, is a masterpiece. It's a Flash game that seamlessly blends the original Mega Man and Ghosts 'n Goblins, a game I could never beat, into something that looks like it came right out of the basement of a bored NES programmer in 1987. It's just a few levels, but extremely fun and a surprising challenge.