The Operative: No One Lives Forever was released on November 10, 2000. It's very unclear the last time it was possible to buy, but it was certainly some time before 2010. Since then, the Monolith-made game has become one of the most notoriously unavailable games of all time, and it seems that this might never change. Which is calamitous, given what things of joy both NOLF and its sequel are. Yet, and lean closer so I can whisper: you can totally still play them.