If you thought that the bosses weren't challenging enough in the original Mega Man game, then perhaps this custom Rubik's cube will do.

Spotted by our very own power mod Twiggy, this Rubik's cube displays all six original boss battles from the NES game and will probably have you cursing in frustration.

For a real challenge, I'd like to see someone play through the game AND solve this Rubik's cube at the same. It can't be that hard.