Cumulative Pack 2 is a huge expansion mod for the first-person shooter S.T.A.L.K.E.R.: Shadow of Chernobyl. It completely overhauls most aspects of the game, and contains vast amounts of new content (hundreds of hours of quests and open-world gameplay, hundreds of new items and characters, dozens of locations). OP-2 has been evolving for over a decade from many other mods such as Narodnaya Solyanka (NS), adapted into a single gigantic mod with several large overlapping storylines