Figure 2.
Illustration of turn taking within the Interactive Round. (a) The participant has a yellow key and can choose either Door A or Door B. (b) Door A is selected. The participant receives 5 nickels and passes the yellow key to the other player. (c) The other player has a yellow key and can choose either Door A or Door B. (d) Door B is selected. The other player receives 6 nickels and passes the blue key to the participant.