Deus Ex: Invisible War

Depending on what you do during the game you'll see one of four main endings, here's how to get them:

ApostleCorp Great Advance
Upload Aquinas Spec to JC Denton, use the machine at the base of the statue and keep JC Denton alive.

Illuminati Age of Light
Upload the Aquinas Spec to Illuminati, destroy the machine at base of statue, kill JC and Paul Denton and keep either or both Chad and Nicolette alive.

Omar Invasion
Don't upload the Aquinas Spec to anyone, destroy the machine at the base of the statue and kill the leaders of all factions.

The Templar Flood
Upload Aquinas Spec to the Templars, use the machine at the base of the statue, kill both JC and Paul Denton and keep Saman alive.

Depending on what you do during the game you'll see one of four main endings; here's how to get them:

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.

Unbeknownst to some, you can actually destroy those big green puddles of goo that Greasels leave behind in certain levels with Flaming Barrels or any fire weapon.

The first method involves using the Hellfire Boltcaster. First, you'll have to get it from the Nassif Greenhouse during your first visit to Old Cairo. All you have to do is aim directly for a puddle, and shoot to make it disappear. It's the only weapon that can destroy them directly, because only the Hellfire Boltcaster will show a health meter when aimed at the puddles.

As for using the flaming barrels or the Flamethrower, all you have to do is dump a dead/unconscious body on top of the puddles, and set it on fire using a flaming barrel or the Flamethrower. After a moment or two, the puddle will immediately disappear. I've tested & confirmed this with the Hellfire Boltcaster in the Antarctica Level, and with a flaming barrel & a flamethrower (plus a couple of unlucky SSC guards) in Apt. 22 of the Heron's Loft building in Lower Seattle. It may take a few shots more with the Flamethrower, but it WILL work.

This is a great help in levels like Antarctica or Germany, where Greasel puddles are scattered in certain areas in ways meant to obstruct your path.

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).