Back to the Future 1999's "Letter to My Colleagues" event is a limited-time special event that usually provides some in-game rewards and items. The gameplay and details of such activities will vary according to the specific rules of each event, but generally include the following elements:
1. Activity time:
6/27 10:00-8/8 4:59
2. Activity description:
Log in during the event to receive gifts from "Matilda" via email.
The email is valid until 4:59 on August 8, please Sichen collect it in time.
3. Email content:
Special level secret box x 10
The above is all about how to play the Letter to Colleagues event in "Back to the Future: 1999". For more game guides, please click on the source code website.