So, the first train of Puzzlemania group has reached its destination. Here are some comments and treats.

Thank you so much!

Also, a little treat for all who joined the Puzzlemania group

Ok, the puzzle is now over. I would like to thank you every person who participated in it! Also, I am very grateful to all who joined the Puzzlemania group. Before the puzzle, it was only me there and now we have 81 members. Really cool! I will do my best to develop this group and I hope you will not be disappointed. And here is the first surprise for you.

Feedback

Whether you enjoyed the puzzle or hated it, I will appreciate a lot if you leave some feedback here.

Whitelist

Also, a little treat for early solvers

Another thing I would like to share with you is the last little car, which unhooked from the main train and got lost while the ride. However, 13 people who did the first three cars quickly, managed to catch this last little car (well, by entering my whitelist). This little treat is specially for them.

Final Hall of Fame

RyukanoHi

Migga

Heeroo

Numeron

Nablez

Metida

Kuzurreesh

aapje

aztech

SpaceClick

tso184

ValyrianSteel

sweetcuppincakes

Solution

You can find the solutions for first three parts following the links:

1. http://www.itstoohard.com/puzzle/uhl0h8qm
2. http://www.itstoohard.com/puzzle/KC0sA2NT
3. http://www.itstoohard.com/puzzle/F695FiKH

After solving these parts, you would find first puzzle for AAA. It says:
OOooo, this is the end of the train! But wait.. something is written on the base of the last car! Something you like very much even without understanding the reason why.. 18966358

You can see the word "base" in the text, so to solve the puzzle you just need to transform the given number to another base. Codes at steamgifts are formed from 26 letters and 10 numbers, 36 symbols in total. That is why you need base36. Transforming 18966358 into base36 gives you BAIJA. Now, you should also have noticed OOooo hint, which helps you to understand which letters will be written in lowercase and which ones in uppercase. Thus, the code for the first AAA giveaways is BAija (Mad Max).

There, you find the last puzzle for the second AAA giveaway. It says:
I love prime numbers. They really help a lot in different areas, e.g. computer security algorithms. But it appears they are also useful here at Steamgifts! Just consider the following: 7² • 31². It is so beautiful and also quite unbelievable. But trust me and believe in it! The only thing I also wonder: why they use a slashed zero in so many fonts.

Solving this one is reallty easy. You just calculate the expression value and get 47089. Then, slashed zero part comes. This glyph is often used to distinguish the digit "zero" ("0") from the Latin script letter "O" (both upper- and lowercase). In this case, you need lowecase "o". Replacing the zero gives you the final code: 47o89 (Wolfenstein: The New Order).

Conclusion

I really hope that you enjoyed the time spent on the puzzles and were not disappointed! I will try to do more puzzles in the future, so stay tuned! Happy holidays!