Two years later, Richardson released Entropy: Zero. The original mod serves as a more antagonistic twist on Half-Life’s old expansion packs.

Entropy: Zero 2 is a sequel, technically, to Breadman's solo mod Entropy: Zero, one of the best-received and better HL2 mods of all time.

Half-Life 2, the superlative Valve FPS game, has a whole new campaign based around Entropy Zero and Civil Protection, ideal distraction as we await Half-Life 3.