The Core is a total conversion single-player mod for Half-Life. Survive the disaster as Maurice Andrews, a low level engineer stationed in Black Mesa during the events of the resonance cascade. Seemingly trapped, Andrews must fight his way to the surface to survive.
Gulp down a refreshing glass of ice cold lemonade and enjoy the summer sun while you can before the Black Mesa Research Facility takes it from you and holds it tauntingly out of reach. The surface is within reach but what's between Andrews and safety? And who has been enlisted to help with the final push?