What is the first FPS game with multiplayer?

fps online game I had to stop playing this game because it was too stressing but it's really fun! But you need to get gold easier, and balanced gun game and knife party,

Aim Trainer is a free browser game that is specifically designed to improve the player's aim in various First-Person Shooter games such as Fortnite, pggame345 Gaming Style provide free FPS games playable on your web browser Official website for the first person shooter Rush Team , War Attack and POLYBLICY