Designed by Jane McGonigal, the author of Reality is Broken: Why Games Can Make Us Better and How They Can Change the World, the idea behind this experimental game is to lighten up the mood of big cities, by displaying acts of kindness towards strangers in the streets.
The game consists of two teams, ranging from five to ten players, but each team is oblivious to the appearance of the members of the enemy squad.
Before starting the game, an area for the match to be held within is selected. A particular street or a building, for instance.
In order to eliminate the member of the enemy team, players must show an act of kindness towards them -- a compliment or a hung, for instance.
The team that gets eliminated first looses. The problem; however, is that, as previously stated, the players do not know how the enemies look, meaning that they must find them through trial and error, resulting in a lot of strangers who are not part of the game receiving compliments.
You can read the full rules on the official website.
Players arrange the game through text messages and e-mails, thus mixing the virtual world with the real one since it was announced in 2006.
While relying on the virtual world, this experiment focuses more on real life. The next one in this list; however, feels as an idea from a sci-fi movie.