The first "game" I ever played was Typing Instructor for Kids when I was about 4 years old. But my actual first game would be Counter-Strike 1.6. It was a few years later and I was at my cousin's place and happened to find him playing it which then led to me asking him if I could play and since became addicted to the Counter-Strike series. It's the only game I still constantly go back to and have never uninstalled from my PC. And it'll probably never be uninstalled, the game is just so nostalgic for me, the graphics were never impressive but the gameplay has stuck with me ever since. It's just something about the odd spray patterns and movements in the game that can't be replaced.