Cross Fire

Cross Fire is an online military first-person shooter for the PC, developed by SmileGate and published by G4BOX. Players assume the role of either a Black List or Global Risk operative, and then compete in modes including Team Death Match and the exclusive stealth-action ghost mode. Also will include a persistent military ranking system, in-game friends lists, a clan formation system, and deep character customization options.

Cross Fire will always be free-to-download-and-play.

First you need to create an account. Is free, just enter a few details. After joining the game play the tutorial mode to learn how to use weapons. Than go to multiplayer and join a server with a lot of users. You will be in the fire in a few seconds. There are a lot of maps and a few of them are very played.like Egypt or Ship.

Join a team and prepare with ammunition for combat. Take pistols,grenades and extra life. When you are entering on the game see all shortcuts and look for places where enemies can hide to not be surprised by their fire.