Half-Life: Absolute Zero

Half-Life: Absolute Zero is a fan-made total conversion modification for the award-winning classic: Half-Life. The aim is to re-create the original ideas and plans from Half-Life's early development with extra polish and care given to them.

Source Code publicly available, read more here!  
Brings early development concepts from Half-Life back to life!  
A re-imagined Half-Life experience!  
New locations to explore!  
Plenty of options to customize!  
Maps created with J.A.C.K.