"synchronize your watches"
Clicking a Watch moves it and all adjacent watches ahead 1 hour. The watches turn green at 9 O'Clock.
The formal guide on "how turn them all green"
Once the watches have all been synchronized at 9:00, text appears: "Time to cash in your chip
What color is it?"
In the the Bellagio movie, there is a green disk with a $ on it--thus the chip in question, and the answer, is GREEN.
Easy way to solve it. Start with clicking any corner watch, then go aroung the box to each watch clicking only once. When you have clicked all 8 outside watches once, click on the middle until it reaches 9 o'clock.
To next puzzle: Current Events.