There's something strange afoot over on Reddit: Sony San Diego are running something of a social experiment with gamers. Weird, yeah? The "experiment" is pretty simple in its concept: Sony San Diego has listed 1000 private access codes for the PS4 game Kill Strain. Redditors are free to take whichever code they wish. The catch is that you have to leave your username next to the code so that others know not to waste their time by trying to enter that code. Simples.