Very nice contest, +1 for you and a little promotion in the giveaways-thread!
http://www.gog.com/forum/general/how_does_one_make_a_gift_aka_gifting_on_gog_for_dummies/post2128

Uhm, you showed a screenshot that shows where you can get the game illegally and explained that that's why you're not in (putting emphasis on "that"). Either you meant what zeffyr and I interpreted into your post or you did not make ANY sense.

That could also mean that seeing a pirate link so close to the original link, I was thrown into a mindfck of wondering that one day, illegal stuff may take over the real stuff. The more I thought, the more I became disappointed in life, the interwebz and gaming. I became so disheartened that I didn't feel like doing anything like playing games until I had a good nights' sleep.
Yeah I need help.

Some hints before I go away:
01 - A guy named Tracer is the only character who appears in all main installments of this series.
02 - This game is not on GOG.
03 - The composer's first name is like a fusion between Michael and Michelle. :D
04 - This game is on GOG.
05 - 5105 + 6775 / 5 - 1890 + 6 * 3 - 3739.

I can guess only the second one. I might have a guess what the 4th one is but I'm not too certain.

So I'm out.

If I had used the main themes of these games, this giveaway would have been over by now. They're all well-known games. ;)

Some more hints:
01 - This music plays while you are visiting Hong Kong in this game.
02 - The name of the map where this song plays is named after a biblical story.
03 - This music plays in a level where you have to capture control points.
04 - This song accompanies the final boss fight of this game.
05 - The number you get from my previous hint is a code for this game's protagonist.

New hints:
01 - The whole game takes place at night time.
02 - This music plays when you first encounter the Cyberdemon.
03 - Cliff Bleszinski was one of the level designers of this game.
04 - This game has two expansion packs. One was made by the original developers and the other by Sunstorm Interactive.
05 - This game has been mentioned in this thread.

fugheddit

Don't spoil it for crying out loud.

Nice contest, look at my guesses I have sent to you.

Thanks!

And the winner is Ciapcian! Here are the correct answers:

1. Deus Ex (The Synapse aka Hong Kong Streets)
2. Doom (Nobody Told Me About Id)
3. Unreal Tournament (Cannonade)
4. Blood (Pestis Cruento)
5. Unreal (Chizra)

grats to the winner.

Very well made contest: thank you Aridoom!

Congratulations to Ciapcian, of course.

Thanks!
It was quite difficult to find the titles, but it was great challenge