Currently, you must define the role of each player in the spreadsheet and cannot write to the spreadsheet to update player roles based on the player's decisions/performance in the experiment. For example, I want two players to compete in a reaction time game where the winner sees certain objects on the next page, and the loser sees other objects. So there must be a way to assign the role of player 1 and 2 to PlayerA and PlayerB dynamically/live to make any real interaction that is not pre-scripted. This is essential for quasi-naturalistic social/behavioural research.