Unlock Metal Mario in Mario Tennis Open

Mario Tennis Open hasn't proven to be a system-seller, though its still a fine distraction for Mario-loving gamers looking to hit the court. The game's coolest feature is definitely the variety of unlockable characters hidden within the game, many of which require the discovery of QR codes in the real world to be added to the cartridge. So, if you've been hoping to play as Metal Mario, watch to the end of this trailer and scan the code you see there. 

One question though. Is Mario more metal than Ozzy?