It's called World Heroes 2, but it's not the official sequel to SNK's game. It is instead a 1994 pirate Famicom game, one which throws together the biggest video game stars of the early 90s into the one bizarre title.
It looks like hell to play, but you've got to admire the attention to detail, which saw characters like Sonic and Mario given appropriate soundtracks, stages and even moves. Sure, most of them were literally ripped from other games, but it's the thought that counts.
World Heroes 2 was released by Cony Soft, a notorious bootleg developer that it's thought was based in Hong Kong, and who specialised in these kind of games.