Here is my second puzzle :) Once again, it's newbie friendly - no special software/knowledge is required to get to the giveaway.

I got the idea for this puzzle some time ago when I was solving one NB264's puzzle. While the format of the puzzle is identical, the solution is different, of course. It’s a one-step puzzle. It’s not a brute force puzzle.

Standard puzzle rules - do not share hints nor the giveaway link.
No CV required.
The game I'm giving away has about 85 critics’ and users’ metascore. Here is a hint about which game I'm giving away(this image is not part of the puzzle).
Giveaway ends in Tuesday(you have more than 4 days).

The puzzle:

[X] [X] [X] [X] [X]
[X] [X] [X] [X] [X]
[X] [X] [X] [X] [X]
[X] [X] [X] [X] [X]
[X] [X] [X] [X] [X]

For puzzle newbies:

You have to solve the puzzle and you will get the 5 correct characters. Then you have to append them to http://www.steamgifts.com/giveaway/ and that’s it :)
Note that the giveaway link can include both numbers and letters and they are case sensitive. Example of a giveaway link(from my previous puzzle): http://www.steamgifts.com/giveaway/PGcXo/.

The solution:

The key to solving this puzzle is to write down these somewhat random characters on a piece of paper or in notepad. Then you can easily notice that most characters appear more than once. However, removing all redundant characters gives you 3 characters only. At this point, you are very close to solving this puzzle.

If you look further, you can notice that not just single characters are repeating, but in fact 2-character mirrored patterns – for example: a 1 – 1 a, Xs – sX. And that’s the solution – removing all redundant 2-character patterns will give you the 5-character giveaway code.

After that you just have to “solve” the order. The order was not designed as a puzzle step, but it seems some people had problems with it. As I said in the thread, you don’t have to rearrange characters and you have to use the most simplified possible order. You can read them in a few simple ways(left-right, right-left, top-down, bottom-up) so as a last resort you could have brute-forced in a few guesses. But if you pay a closer look you will notice that there is just one character in each row so you can narrow this to either top-down or bottom-up. Top-down it is :)

It may sound a bit complicated, but maybe I just overexplained.

Here is a .gif animation that will show you the solution: clicky