I pulled the links from GOG's Facebook page to make it easier to check the videos for those that avoid Facebook and Twitter.

The first batch of contests took place on June 24th during the so called "Adrenaline Rush" of the sale, along with the flash freebies.

Video #01

Video #02

Video #03

Video #04

Video #05

Video #06

Video #07

Video #08

Video #09

Video #10

The answers to these contests were posted by GOG here in the forums.

================================================================================
The second batch of contests were presented on June 29th for the Summer Sale Grand Finale.

Video #11

Video #12

Video #13

Video #14

Video #15

Video #16

Video #17

Video #18

Video #19

Video #20

Official answers for these contests have not been posted, but community answers are being collected here. (You might want to thank the original posters below with a +1).

We are still missing solutions to video 14.

They haven't, so let's help get started

Flash 13
Chris Sawyer's Locomotion
Simon the Sorcerer 2
Uplink: Hacker Elite
Zeus + Poseidon (Acropolis)
Phantasmagoria 2

Flash 19
Superfrog
Botanicula
Slipstream 5000
Torin's Passage
Reus

Flash 20
Constructor
Eschalon: Book I
Gabriel Knight: Sins of the Fathers
Moto Racer
PixelJunk Shooter

Flash 18
Still Life
Alien Breed: Tower Assault
Conquest of the new World
Outcast
Incredipede

Thanks! I was hoping someone would do this so I could see how many of them I had actually seen. Now I will be able to check my answers against the real answers and see just how many I got wrong! lol

Cheers madth3 for this thread, very handy for those that would like to try their hand on the videos at their leisure.:-)

FLASH 12

Anvil of dawn
Hocus pocus
Pod
Tiny and big - grandpas leftovers
To the moon

FLASH 15

Jade Empire
Return to Krondor
Starflight
Waking Mars
Puddle

FLASH 16

Age of Wonders 3
Avadon: The Black Fortress
Cannon Fodder
Wing Commander: Privateer
Darklands

Thanks to JMich, jpelgrom, Fonzman, Leroux, Artoemius, SCPM, Stooner, Spinorial we have the following solutions to the second part:

Flash 11

Street Fighter Alpha 2
Duke Nukem 3D
1849
Ether One
Shadow Man

Flash 12

Anvil of dawn
Hocus pocus
Pod
Tiny and big - grandpas leftovers
To the moon

Flash 13

Chris Sawyer's Locomotion
Simon the Sorcerer 2
Uplink: Hacker Elite
Zeus + Poseidon (Acropolis)
Phantasmagoria 2

Flash 15

Jade Empire
Return to Krondor
Starflight
Waking Mars
Puddle

Flash 16

Age of Wonders 3
Avadon: The Black Fortress
Cannon Fodder
Wing Commander: Privateer
Darklands

Flash 17

Aquanox 2
Ground Control 2
Shogo: Mobile Armor Division
Pid
Realms of the Haunting

Flash 18

Still Life
Alien Breed: Tower Assault
Conquest of the new World
Outcast
Incredipede

Flash 19

Superfrog
Botanicula
Slipstream 5000
Torin's Passage
Reus

Flash 20

Constructor
Eschalon: Book I
Gabriel Knight: Sins of the Fathers
Moto Racer
PixelJunk Shooter

You've copied answers to Flash 15 twice :)

Thanks for this thread BTW!

As I say in my classroom: It was on purpose to see if people were paying attention. :-)
Fixed now.

Video 11 looks to be:
Street Fighter Alpha 2
Duke Nukem 3D
1849
Ether One
Shadow Man

Video 14, I only recognize game 4, Arx Fatalis, and Video 17 I only recognize the last 3: Shogo: Mobile Armor Division, Pid, and Realms of the Haunting

Video 17 the 2nd game is Ground Control 2.

Here's what I had for 17:

Aquanox 2
Ground Control 2
Shogo: Mobile Armor Division
Pid
Realms of the Haunting

I never heard from GOG, though I'm fairly certain I got them right. I see I got 16 right, too, and that one I was more uncertain of.

I am curious when we will get an answer from GOG concerning these contests. They seem busy with other things at the moment (Divinity Original Sin release, Witcher Adventure Game Beta, ...)