Decypher for keys - My keys are gone:P

I applaud ye.

Thanks! Activated Xotic DLC! Was hella tricky! :>

Got Critical Mass, Hacker and Fortix, thank you, sir.

Activated Nikopol and Fortix 2. Thanks! What was the original cryption for Xotic?

I have no idea how to decypher them.

There should be a hacker+critical mass combo left... And 2 guys claim to have used a fortix key while there was only 1:S

Can you check your 2nd Critical Mass key. When I decode it it says 'invalid' whereas all the others say 'duplicate'.

nice idea for a ga!

all taken?

Thank you for the giveaways, a good opportunity for spending some time on wikipedia :)
I'm failing terribly though and everything I try come up as invalid - would anyone mind showing me how you did the deciphering?

Hi MarvelousMax. Thanks for the giveaway.
I was wondering, is the example key you have at the top an actual key. I tried to follow your instructions but when I tried to input the steam code to see if I was doing it right I get an invalid Code not a duplicate code

Duplicate,i guess i'm too slow but thanks.

Too bad I missed this, would have been able to put the crypto class I took last year into use. Ah well, I own these games anyway. Thanks!

no understend how do this=((

I liked this one Max, thank you. Same story, different numbers:
CriticalMass GVRHC-N8ATA-RLZ8K +4
Fortix2 D9C9X-V8ZW2-AOQYK -2
BunchOfHeroes OK8J6-9Y3C0-SD8K2 +13
HackerEvolution XTTA3-AYEO7-9QEPS 0
Please post if you used one. Wait a couple minutes before taking all if you don't mind. Thanks!

I could not, how does it work?

Is this legal ?

Can someone explain this to me, please? I dont get this Vigenere Cipher blablabla thing :D :$

Not that i want to milk ya... but i'm looking forward for this giveaways in future , i find this really cool :)