The game was created using Valve's Source engine, developed alongside. Players control Gordon Freeman, who fights against the alien Combine with allies including resistance fighter Alyx Vance, using weapons such as the object-manipulating gravity gun. Like the original Half-Life (1998), it combines shooting, puzzles, and storytelling, and adds features such as vehicles and physics-based gameplay. Half-Life 2 is a 2004 first-person shooter (FPS) game developed and published by Valve. Tablet: The program has been treated (does not require data entry / enter any data)