I got these humble bundle steam game codes, but I don't like them, so I will do a giveaway.
first code for Oscura: Lost Light:
(all caps)
However, the last two letters are missing. I will give a hint on what they could be:
They are an abbreviation of a popular pc monitor type. (2 letters).
The second for metrocide:
7E9VZ-NLQN7-__AYX
However, on the two _'s there should be two numbers:
The hint is : it is a sexy prime number :). It is also a 'happy number', you can look up the definition on wikipedia.
And the third for OTTTD:
9D2AQ-V2X78-Y__EN
Hint: on the _'s there should be a number: finish the sentence: I Can't Drive ...
Good luck
(Please only redeem if you like the game, selling them is pointless, they are basically worthless keys.)