I want to create GOGmix with all the games that require multiplayer key.
I choosed all the games that I know but maybe I've missed something.
GOGmix is here: http://www.gog.com/en/mix/games_that_require_cd_keys
Please, check this list and add missed games to this post.

I wouldn't add TW2 to that list. Firstly, you receive the key automatically (no need for contacting Support) and secondly, there is no multiplayer.

(hehheh)

Clever way of promoting your gog mix. Albeit the oldest trick in the book.

Heck, I'm gonna "like it" just because.

This is a really good idea. I'm pretty sure I own some games that I haven't got the keys for yet.

Unlike the "Games I thought about this morning while eating a sandwich" lolrandum GOGmixes (bad) and thematic collections of varied quality and humor, this one is objectively useful and thus needs promotion.

You have Empire Earth: Gold Edition on your list - does this game really require unique CD key? I can not see such note about requesting multi-key on GOG's game page.
http://www.gog.com/en/gamecard/empire_earth_gold_edition

Many games don't have note about cd keys (you can see far cry for example).
When I played EE 1 online last time (about 3 years ago), it required CD key.
Also you can look at this thread: http://www.gog.com/en/forum/empire_earth_series/cd_key_entry_ee1 Yes, you receive the key when you buy the game but it's still the CD key :)
I'll add the notice about that in GOGmix

In such case such listing of games is good. I sometimes just buy the game on promo deal and do not have time to check it after soon. So far I requested all needed keys that were in description on game page, but now it seems that it can not be enough. ;)

EDIT: in link you supplied there is an answer that now CD key is not really needed? link: http://www.gog.com/en/forum/empire_earth_series/cd_key_entry_ee1/post15

Yes, if you want to play multi.

Even over LAN?

From game page:

I read that, but it's not exactly...very "specific".

I upvoted your list because you have a female avatar, and are from Russia.


Alright... It also helped me, as I did not know about the key requirement for multiplay in one of those games. Thanks!

Since the patches for The Witcher 2 are being added as files on your content page I don't know how that can possibly still qualify for "needing a CD key."