Timescape or Time Machine escape is one heck of a cool game, I only wished they could have put the time traveling theme into a more creative use. Like you go to the past, and make this and that on the room, so when you time travel back into the future you can access this. Well, here's an idea! If only I knew how to do flash games. Anyway, here is a nice video for Timescape walkthrough.
Timescape walkthrough: Time Machine Walkthrough