Not every CD key is a Steam key. Always look for the Steam logo before you buy. Have a key that won’t work? Drop a comment below with the error message, and the community will help you troubleshoot.
You can usually copy the key from a retailer’s email or a text file. Just highlight the code, press Ctrl + C (Windows) or Cmd + C (Mac), then click in the Steam box and press Ctrl + V (or Cmd + V ). add cd key to steam
There’s a special kind of satisfaction in picking up a physical copy of a game at a discount, finding an old gem in a bargain bin, or snagging a digital key from a third-party retailer. But unlike the "old days" of inserting a disc and playing, modern PC gaming almost always runs through Steam. Not every CD key is a Steam key