Breathing actions are used to augment controller-based input by giving superpowers to players in two VR games. Blowing out long and strong turns you into a fire-breathing dragon, while holding your breath sends you into stealth mode. By using breathing as a directly controlled physiological signal, BreathVR can facilitate unique and engaging play experiences through natural interaction in single and multiplayer virtual reality games. Paper available here: http://web.media.mit.edu/~sra/breathvr.html