The team has created a straight port of this game to PC and started active development in mid-October of 2005.
Half-Life: Decay is an add-on included in the PlayStation 2 port of the first-person shooter computer game Half-Life, developed by Gearbox Software and published in October of 2001, and has now been released as a mod for PC by independent Ukrainian developers along with the help of other European developers/fans. The Replay Experience Experiment aka TREE.