Go to the underground UNATCO ruins on Liberty Island. Take the U.N. flag from near the beginning of the ruins and find your way to to James Manderley's office from the first Deus Ex. Hold the flag while flushing the toilet inside the bathroom to play the programmer's party mission.
Find the mutant and get a sample before bartering with the Omar in Seattle to get a 50% discount and a free Black Market Biocanister. It is in the basement of Club Vox in Upper Seattle.
This is a pistol with a zoom function instead of a flashlight, and also seems to be more powerful. It is a good substitute for a sniper rifle. It is inside the Nine Worlds Tavern in Trier Germany. Once inside, there is a part where you will see stairs that lead up to a closed door and down into a bar. Go up, pick the lock, and enter. You will meet the Omar here if you can find their contact. In one of the corners under some junk (you must throw it around as it hides the stash), you will find the weapon along with some other assorted items.
This is an energy sword that hurts very much. Go inside JC's sanctuary. It is on top of a bookshelf when you enter the first remembered area (Maggie Chow's apartment, Hong Kong, from the first game).
Use explosive crates whenever you can to blow up cameras, beams, turrets and almost anything else that gets in your way.
This is a boltcaster that makes enemies burst into flames instead of being knocked out. Its inside the Nassif greenhouse and is slightly difficult to get. Go through the warehouse and into the office, then make a left in the hall (away from hydroponics control). Then, save the game when you get to the balcony save (so you do not have to run all the way around). Carefully jump to the beams sticking out on the other side of the rail. Then, jump to the ledge to your right. It is small, but you can stand on it. Use the outcropping window as a foothold to jump up onto the balcony above you, then go through the vent shaft. In this room you will find the weapon in the corner amidst some junk.
You can use the alternate fire of the proximity mines to set a timer. This is also useful for blowing up beams and turrets that are not triggered regularly.
This is a pistol with a red flashlight. In Lower Seattle, you can find this under the sewer grate in front of the Greasel Pit Bar. It is lying near or under an Omar corpse. Watch out; you will have to kill two Karkians to get it. If you do not like close encounters, once they start chasing you, climb out and drop a concussion grenade on them.
Shoot cylinders that contain toxic gas to fill a the room and kill anyone within the blast radius. Also, if you have the strength modification you can pick up these cylinders and throw them into a desired room. This is a good way to kill guards without being seen.
This is a knife that does excellent damage and stuns your opponents with the first hit. In Upper Seattle within the Emerald Suites building, you can find the Toxin Blade. It is in the apartment next to Dr. Nassif's under the pillow on the bed. There is one hostile in the apartment.
This is a SMG that fires Spider bots instead of flash grenades at the expense of an entire ammo clip. It can be found in the Cairo Archology on your second visit. From floor 107, near the Templar recruiting booth and Tarsus academy, go down the ramp into the maintenance area. Make a left and look on the right wall for an opening. Crawl in, make a left, then look left for another opening. Push the junk out of your way and enter the little hiding place. It is near a corpse.
Using the Active Black Market Biomod that allows you to control an EMP Armed Spybot next to an Engineering Bot that refills your Bioelectricity. This allows you to have an infinite range. You can destroy all electrical equipment and bots in the vicinity without having to use energy cells or risk health.
When you climb a ladder, you will automatically put away your weapon. Press B to take it out while still on the ladder.
When in any area, check dumpsters and look behind small boxes or items for multitools, food, guns, ammo, etc.
In the Emerald Suites in Seattle, there are several ways to enter the penthouse, Dr. Nassif's apartment, and apartment 2226 in which the lawyer who the owner of Club Vox asks you to kill, lives. If you have several Multitools, use them to disable the power in the elevator shaft. From there you can access a vent shaft that leads to the Minister Of Culture's penthouse. At the end of the hall (not the penthouse), you can find a Multitool under the staircase. Use it to disable the power to the alarms of apartment 2226 and you can break the glass sunroof to gain entry. You can also use the Glass Destabilizer and save your Multitool. However, be sure to have an EMP or Scrambler Grenade for a Security Bot on the roof. Elsewhere in the suites is an easy to find vent shaft that leads into Dr. Nassif's apartment.