: Retail keys from the 2007 physical release cannot be activated on Steam. It is not a SteamWorks title, so physical keys are only valid for the original disc installer.
The Ultimate Guide to TimeShift CD Keys: Master the Flow of Time timeshift cd key
Anyone have a spare Timeshift CD key? Or know where to buy one? : Retail keys from the 2007 physical release
Many retro gamers argue that since you cannot buy Timeshift new from a publisher (Vivendi no longer exists as a publishing entity, and Saber Interactive doesn't sell it), it is "abandonware." Sites like offer the ISO files. Or know where to buy one
For the most secure experience with guaranteed support, purchase from these official storefronts:
Because the game is delisted, finding a legitimate key is difficult. Here is a reality check on your options.