In Half-Life 2, players can use the Gravity Gun to pick up virtually anything in the environment before shooting that object as a projectile. This complex functionality demonstrates the versatility and fidelity of the sophisticated Havok engine, which simulates Newtonian physics, taking into account mass, gravity, friction, and so on, of each object in the game.

GWR Video Gamer’s Edition 2008, title: First game to feature a Gravity Gun.