Ruin it for Everyone Trophy in Back to the Future - Episode 3: Citizen Brown
Ruin it for Everyone
Coax Edna out of the courthouse with the buzzer.
How to unlock Ruin it for Everyone
*Missable* As soon as you get into Hill Valley, you are able to walk over to the courthouse and use the buzzer to ask to see Doc. Buzz in 3 times and this trophy will unlock. This can be done at your leisure, but be sure to do it at least before following Biff down the Decycling Chute.
Refer to "Final Solution" for the trophy walkthrough.