Buzz and Don are back together in Don's office. Don can listen to the past with the Haunter's Mark. You should try it on different items.
This is the low-spoiler guide for "Don's office" puzzle in Gibbous - A Cthulhu Adventure. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.