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. 2015 Sep 29;5:14559. doi: 10.1038/srep14559

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Two players face each other on screen, actor on bottom, and can either push or pull their tray by clicking buttons for these options. Pushing the tray delivers three coins to the partner and causes one coin to fall into an abyss. Pulling the tray delivers one coin to the actor and causes the three far coins to fall into the abyss. Panels a-c show the sequence of play from the (a) starting position, (b) the result of both players choosing push (CC), and (c) the payoffs to both players shown in the right side history bar. Panel (d) shows the result of the actor pulling and the partner pushing (DC).