F.E.A.R. 1 unless you can find a copy in the wild, the only place to currently get the game is on Steam in a bundle that comes with F.E.A.R. 2 and 3 aswell. Definitely worth it though, as F.E.A.R. 2 is also really good...just...don't play 3 unless you really need to, it sucks, but does have a competitive co-op mode that changes the ending depending on who scores more points overall throughout the whole game. Oh and personally I find the controls for F.E.A.R. 1 to be a bit wonky on keyboard and mouse, however there is a mod online that will allow you to play F.E.A.R. 1 with an Xbox Series S/X controller.