I got one 6 bucks and one 10 bucks coupon from Witcher 2 GoG thingy.

So, what do I get for it? Because I don't know!

List of games I own:

Age of Wonders
Arcanum
Arx Fatalis
Beneath a steel sky
Betrayal at Krondor
Beyond good and evil
Blood
Blood II
Broken Sword 1
Broken Sword 2
Caesar III
Call to Power II
Celtic Kings
Chaser
Commandos ammo pack
Commandos 2+3
Dark Star One
Descent 3
Die by the sword
Disciples
Disciples II
Divine Divinity
Dragonsphere
Duke Nukem 3D
Duke Nukem: Manhattan Project
Earth 2150
Earthworm Jim 1-3
Evil Genius
Fallout
Fallout 2
Fallout Tactics
Freespace 2
Ghost Master
Giants: Citizen Kabuto
Guild
Heroes III: Complete
Icewind Dale: Complete
Icewind Dale II: Complete
In Cold Blood
Jagged Alliance
Knights and Merchants
Lords of Magic
Lure of the Temptress
MAX 1+2
MDK2
Might and Magic 6-pack
ObsCure
Original War
Outcast
Perimeter
Praetorians
Prince of Persia: sands of time
Psychonauts
Realms of Arkania 3
Redneck Rampage
Rise of the Triad
Sacrifice
Sanitarium
Screamer
Seven Kingdoms
Seven Kingdoms 2
SHOGO
SpellForce
Stronghold
Stronghold: Crusader
Teen agent
Mean streets
Oabdira Directive
Total annihilation
Tropico reloaded
Two worlds
Tyrian 2000
Unreal II
Unreal
Unreal Tournament
Unreal Tournament 2004
The Witcher 2 (yay!)

Maybe looking through the GOGmixes will help you decide?

BLOOD

I even made a thread to promote the game here on gog just like with painkiller :)

http://www.gog.com/en/forum/general/blood_game_promotion/page1

It would probably help if we knew what kind of games the OP likes. Personally, for the $5.99 I'd definitely consider Sanitarium, it's a good use of a weekend.

That would depend a lot on what you already have ;-)

I have Blood, is one of the best FPS games ever, period. Way better than Duke. Meh, I have Sanitarium as well. Just shoot I play basically everything, I should probably post list of owned games thou, that would be useful.

AMAZING GAME. There is nothing in this world like Blood...

Yes, it would ;-) Otherwise we'll just post suggestion after suggestion, followed by you replying "have it, got it, got that too".

See? I have added a list of games I own, now be a nice Wishbone and wish me a game! Well it distributes oxygen in your system and such

Hmm, you already have most of the games I'd suggest. However, you have a definite shortage of Settlers 2. It's a pity it's $9.99, but I'd say it's actually worth it. At least I bought it at full price with no regrets. For the $5.99 one I'd have recommended Hostile Waters, if it hadn't been removed from the catalog :-(

Edit: Oh, you don't have MDK? I'd definitely recommend that. I never could get the hang of MDK2, but the first one was fantastic.

I played the hell out of Settlers, thanks for suggesting MDK thou, I'll think about that

I stand by Another World and Gabriel Knight.

If you liked Jagged Alliance, you might consider Desperadoes. I played a bit into it and found it to be enjoyable.

And yes, I am aware that that one was a freebie.

Just keep in mind that it's very old. The controls are a little bit awkward compared to modern games of the same type (I believe I originally played it with both hands on the keyboard), but it's a great game with a quirky sense of humor.