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Find the M-79 grenade launcher on the second to last level (New York Sewers) to unlock the following seven multi-player characters: Ninja Gabe, Scuba Lian, Unit 1 (armored trooper from the Bio-Lab Escape level), Dr. Elsa Weissinger, Uri Gregorov, Lawrence Mujari, and SWAT officer (helped in the New York Slums level). The M-79 is near the end of the level (in the parking garage). Near the top of the stairs is an open doorway into the parking garage, where a black van is driving past. Instead of exiting the stairwell at that location, keep climbing up the stairs. There will be five Agency operatives scattered on the landings above armed with silenced HK-5s, grenades, and M-79s. Use the M-79 to clear them out. The M-79 is on the top landing.

In the second room at the start of the Agency Bio-Lab Escape level, (after receiving the incoming radio traffic) are two vents that you can crawl through. The one on the left is the correct exit out of the Bio-Lab. The other vent leads back the way you came toward the Operating Room where you overheard Dr. Weissinger in the previous level. Head down this second vent back the way you came from. When you exit the vent, there will be one Unit 1 trooper on the left in an alcove. Run past him down the U-shaped hallway which leads to the Operating Room. You should be able to see the autopsy table through the door. There are three more armored troopers in the operating theater, one low by the door and two on either side up in the theater seats. Roll into the room past the low trooper. If this is not done, when you get near the door he will run in front of it to block your path. Run immediately toward the table with the computer. Climb up on to the table, and then up onto the balcony (you will probably get shot up pretty bad while climbing up). Then, roll toward the center of the back wall and into a small room. There is an M-79 grenade launcher in this little room which unlocks the Agency Computer Lab map. Gabe will say "Got it" to confirm that it has been collected. You do not have to finish the level for the map to be unlocked.

Find the PK-102 in the Moscow Streets level. There is a point where two cars will try to run you over at the same time, and you have to leap and grab a pole above you to avoid them. After this happens, drop down, and go back and search the two newly crashed cars. Face the tail ends of the cars. The car on the right has the PK-102 inside. The cars are on fire, so search carefully. Additionally, after the cars crash an enemy will get out of each car. At least one of them has a M-79 grenade launcher.

Find the binoculars in the Colorado Interstate 70 level. They are located behind the first closed door on your left that you reach. Press Triangle to open the door. This reveals a passage. Go left, open another door, and enter the room. The box containing the binoculars is in this room.

Find the dirty laundry in the New York City Slums District level in one of the washing machines in the first Sniper Building of the level. This is the building that is similar to the slums district level in multi-player mode.