Stop the Ceph rampage in New York. Our Crysis 2 Walkthrough gets you ready for multiplayer with weapons and gear, a full campaign walkthrough, and unlockables.
Mission 4 - Lab Rat
Cloak and move through the window on the right. Stealth kill the sniper and steal his rifle. Use this new weapon to snipe the turret users on the opposite roof. Sneak over the dock and kill any remaining enemies on the roof.
Keep moving forward and climb up the steps, killing or avoiding enemies along the way. Dismount the turret ahead and use it to kill the Cell agents inside. Climb into the lift on the left and arrive at the next floor.
Cloak again and kill the three soldiers inside. Destroy the computer holding Gould's files. Shoot down the helicopter flying outside. First kill off both of the gunship's gunners. Next kill the Cell agents that enter the small room. Be sure to steal a JAW rocket launcher from one of them. Shoot this deadly missile at the helicopter to finish it off.
Drop down and smash open the gate. Head back up the next set of steps and across the beam bridging each roof. Sneak past or kill the next few Cell soldiers and smash through the door ahead. Head up the elevator and meet with Gould. Exit out the halls and destroy the last remaining Cell agents. You'll smash through one last wall to end the mission.