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Know of any good PC games that don't require a CD Key? - list of serial key xp sp2

I want to play on the computer and want all to know that not require a CD key at all. The players may either old or new, and no matter whether the game requires to play the CD in the drive. I know a little, and I am looking for more. For example, Delta Force - Black Hawk Down, Theme Hospital, The Game of Life, etc.

My computer is fixed with Windows XP Service Pack 3. Configuration required for graphics, CPU and memory are not a problem.

Ideas? Please indicate only PC games that do not require a CD key / license / serial play. Thank you! :)