Second Strike includes an additional single player campaign called "Unfinished Business" with refined AI and new challenging levels. It also introduces a new multiplayer mode (Capture the Flag) and three additional weapons: the M200 and L96 sniper rifles and the Desert Eagle high caliber pistol. Its fun to have with this game because it just adds more to the story. The downfall of this dlc is that there is only 3 campaign missions in single player which doesn't take to long to beat. The multiplayer aspect of this game is still alive but low in compared with other games today. If you enjoyed this main games story then this is one dlc not to pass up. I enjoyed the dlc and the main game, if you love sniping then this is game for you!