A poorly hidden challenge [Whitelist GAs now open!]

So here's the deal:
I've made 3 public GAs to get rid of some excess bundle keys in the past 2 weeks. There's a challenge hidden in plain sight in those GAs. .

Anyone who figures it out and participates before the last GA ends (= somewhere Friday the 11th) will get a temporary spot on my whitelist. I'll build the whitelist sometime after the last GA ends. Don't know what time I'll get around to sorting that out, so even if the GA has ended you might be able to sneak in - I'm not going to be picky.

Once that's done, I'll create a bunch of whitelist GAs.

Why post here at all ? Because:
a) People who are acitve on the forums instead of only looking at public GA's deserve a head's up
b) Most of the people from previous point probably already picked up the games involved at some point, so they'd never see the public GAs
c) I couldn't make my mind up on what I'd give away, so I let the poll decide.

Update on the poll: It's served it's purpose, further votes will be ignored. Long version in this post http://www.steamgifts.com/go/comment/z1fP1Nq. Short version, the whitelist GAs will be a few of my presonal recommendations.

Update on the GAs:
No more teasing, find out if you qualify by clicking these links:
Another World
Fingered
Ghostbusters
Killer is Dead
Shadow Warrior
Tetrobot & Co.