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On Nov 16th, 2004, Valve released a sequel to their most acclaimed franchise Half-Life 2. Debuting their latest engine technology: Source ® - founding the path to innumerous creation of community mods since. The former Zombie Panic Team didn't waste the opportunity and began the work on their sequel, using the Half-Life 2's Source Engine as a base, leading the release of Zombie Panic! Source in De…