y as a double agent spy for the first time ever. Take on dual roles of covert operative and ruthless terrorist, where your choices of whom to betray and whom to protect actually affect the outcome of your game. Experience the relentless tension and gut-wrenching dilemmas of life as a double agent. Lie. Kill. Sabotage. Betray. All to protect the innocent. How far will you go to gain the enemy's trust? As covert operative Sam Fisher, you must infiltrate a vicious terrorist group and destroy it from within. You'll need to carefully weigh the consequences of your actions. Kill too many terrorists and you'll blow your cover. Hesitate and millions will die. Do whatever it takes to complete your mission, but get out alive. Double agent gameplay and branching storyline - Play both sides and decide between opposing NSA and terrorists objectives. You choose who's priorities to support, and who's to undermine. Your actions affect the story and gameplay, leading to shockingly different endings. Upgradeable weapons and gadgets - As you progress get access to upgraded prototype gadgets and weapons, like improved night vision, based on your choices and covert skills. Authentic double agent tactics - Use realistic tactics, based on testimonies of actual undercover agents, to sabotage the enemies' plans. Use realistic upgradable weapons and gadgets. Play multiplayer or co-op with 2-6 players online or system link.