You have been randomly and anonymously paired with another participant. Both of you must choose either Deny or Confess. This gives four possible outcomes, each with a different payoff, as shown in the table:

In each cell, the amount to the left is the payoff for you and to the right for the other participant.

Participant B
Deny Confess
Participant A Deny {{ Constants.both_deny_payoff }}, {{ Constants.both_deny_payoff }} {{ Constants.betrayed_payoff }}, {{ Constants.betray_payoff }}
Confess {{ Constants.betray_payoff }}, {{ Constants.betrayed_payoff }} {{ Constants.both_confess_payoff }}, {{ Constants.both_confess_payoff }}

Participant A is the first mover and can decide to deny or confess. After that, participant B (the second mover) will be shown the decision of participant A and participant B will have to decide whether he/she should confess or deny.