Well, that certainly was a long-winded puzzle. Thanks.

I used notepad and the "Replace..." function to do the first part. For the second part I used this. Over and over and over.

I used notepad++ to eliminate the "<a href=" things, and incorrect links and found the correct link soon.
I used this for the decoding. The site I usually used nearly crashed my browser. XD

Finally!
For the first part i used Safari's Developer plugin and scrolled through the list looking for different URL's
For the second part i used this again and again until i got the code.
Thanks for the giveaway. Good luck to everyone!

Yay, I already have it! >.<

For the first part, I used notepad to replace duplicates.
For the second part, I wrote a small C# program to decode base64 in a loop.

Thanks, it was fun. I really hope i win.

Nice puzzle, thank you. I wrote a small recursive function in Python.

Thanks for the puzzle, I'm not interested in the game though. I used regular notepad to remove the repeating links. And for the BASE64 part I used this.

thanks for puzzle :)
I used jQuery for filtering pastebin links, then wrote small tool in python for recursive base64 decoding :)

I'm not interested in the game, but thanks a lot for the great puzzle!

I looked over the pastebin links one unique link at a time via looking at the html source; I replaced all elements with the same link with empty space until a unique link came up.

From there it was interesting. I was pretty certain it was base64, but it wasn't decoding like it was. I ran one line through a base 64 decoder a few times and noticed it was shrinking, but didn't think much of it at the time. I started googling parts of the base64 string.

It turns out the start of the string is actually used for the hax.tor.hu 3rd level! This made my life slightly easier, though it was difficult to find tips for it. I finally found a tip that said to just keep running it through the base 64 decoder, heh. I tried this out with a small piece of base64 and it worked. So I created a quick recursive base64 decoder in PHP and spent a very brief period of time figuring out how many iterations it would take to get to the giveaway string. In retrospect, I could have simply just had it iterate indefinitely until the string was 5 characters, as I now notice that all giveaway keys are always 5 characters long.

Thanks for the fun puzzle, have a nice day!

Thank you for the onions. That was actually fun in its repetitiveness. I didn't use any exotic tools but simply abused notepad and good ol' xlate =)

Thanks! used some decoders on the net

http://ostermiller.org/calc/encode.html
After I realized what it is, I started to look for a tool to decode multiple times. Google helped me out with this. I just had to keep pressing decode :D

thanks, i used base 64 decoder for it,was fun. was about to give up and then said why not. turned out correct :)

stage one: ctrl+f the source code for pastebin.com/A-Z to find the unique link

Stage two: Decoded it!

PHP FTW: preg match all() + base64_decode() loop...

Too easy.

Nice puzzle, thank you. :-)
I used Notepad++ to remove the wrong pastebin links and xlate to decode Base64.

Thanks! Well, it was pretty easy, a simple search and replace to find the real link and a python script to decode.