Half-Life 2

Half-Life 2 - The legendary Valve shooter about the adventures of physicist Gordon Freeman, who does not need to be introduced. In the story, the main character goes to a secret research complex called "Black Mesa" to participate in an experiment on a mysterious alien crystal. Unexpectedly, an uncontrolled phenomenon occurs in the process, as a result of which aggressively-minded aliens from the border world of Xen begin to teleport to Earth en masse.