  While physiological sensors enter the mass market and reach the general
public, they are still mainly employed to monitor health -- whether it is for
medical purpose or sports. We describe an application that uses heart rate
feedback as an incentive for social interactions. A traditional board game has
been "augmented" through remote physiological sensing, using webcams.
Projection helped to conceal the technological aspects from users. We detail
how players reacted -- stressful situations could emerge when users are
deprived from their own signals -- and we give directions for game designers to
integrate physiological sensors.
