It was developed by McGill University in Montreal.
I've been playing it for a couple of months now. I think it does help you deal with rejections, not to dwell on negative thoughts etc. I think it helped me not to focus too much on negative things in my life and just carry on.
Just click on a smiling face among all those frowny faces. There is always one smiling face.
I think it also helps me with my depression. I feel better since I started playing the game.
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