The Mega Man series' have always been at the forefront of graphics and sound and Mega Man Zero is no exception. The Game Boy Advance has shown that it can do some pretty impressive things with 2-D graphics, and MMZ pushes past the current limits. The characters, environments, and backgrounds are handcrafted pixel-by-pixel and look phenomenal. The graphics are crisp, clean, and detailed. Everything is easily seen and it does not suffer from the 'darkness' problem seen in some games like Castlevania: Circle of the Moon. For those of you who played the Japanese version you will only notice one difference, the blood has been removed. I was a little disappointed with this decision since it definitely helped the game retain a very dark atmosphere.
The sound effects are pretty much standard for a Mega Man game. You have your typical robot battling sounds. The only really prominent thing to mention would have been the voices, but it seems Capcom chose not to translate the voice acting for our version, and the original Japanese voices have been removed. The music in Mega Man games has ranged from stellar to average and Mega Man Zero finds itself in between. There are 2-3 remixed songs from past games, such as Zero's theme from Mega Man X, and the rest are typical Mega Man fare.