What was the first game on PC that you put a lot of time into? It can be an online game or offline game. It can also be as old as you want it to be. I think the first game I really put a lot of time into was sort of this counter-strike ripoff called "CrossFire". Back then I had a pretty poor PC which couldn't run a lot of things. It was a fun game for what it was, and I put hundreds hours of money and time into it. It's sad that it didn't really go anywhere, but it helps me out in other FPS games I play on the PC now, having some experience.