From the MindHabits website:
"Montreal-based MindHabits develops science-based videogames designed to help players reduce stress and build self-confidence. Founded on social intelligence research by Dr. Mark Baldwin at McGill University, these stress busting, confidence boosting games use simple, fun-to-play exercises that help players develop and maintain a more positive state of mind."
MindHabits allows you to adjust the faces that you see on the screen:
"Click the “Game Options” button and try moving the “neighbourhood” slider back and forth until you find a mix of faces that matches where you live as closely as possible."
Here is a screen shot of one of the MindHabits games:
Stephane D. Dandeneau, Mark W. Baldwin, Jodene R. Baccus, and Maya Sakellaropoulo, Jens C. Pruessner (2007), Cutting Stress Off at the Pass: Reducing Vigilance and Responsiveness to Social Threat by Manipulation of Attention (pdf) Journal of Personality and Social Psychology, 2007, Vol. 93, No. 4, 651–666 American Psychological Association 0022-3514/07/$12.00 DOI: 10.1037/0022-3522.214.171.1241