Edited sentence: Examples include Call of Duty: United Offensive, Star Craft: Brood War, Command and Conquer: Red Alert 2: Yuris Revenge, Half Life: Opposing Force.High-Quality Expansion packs often show the original game in a new light, or complement the original's storyline.In Contrast, low quality expansion packs are little more then random missions.They can often seem like a new game in themselves, though somewhat shorter.They will also usally have new weapons, features and characters