Red Fang Headbang! (game)
WK Studio / Wieden+Kennedy
A music video that you have to headbang to play/see. An homage to the 90s arcade fighter games with an amazing boss level (featuring Brian Posehn) at the end. Oh, and a headbanging song to boot. Game info page here. iOS Store link here and Google Play Store link here.
Red Fang Unleash First Music Video Turned Video Game App
You Have to Headbang to Play W+K's Video Game for This Metal Band
Additional screenshots from game: