Challenging quest for Habra residents: 25 levels



    Hello everyone, my name is Vlad, I am a programmer at Mail.Ru Group. In 2010, I did a quest for habrayuzer and more than 10 thousand people passed it. For this day of the programmer, I decided to do something similar, but I did not have time: I complicated the quest and could not stop. (-:

    Solve the puzzle here: puzzle.mail.ru

    Prizes! For the first one to answer all 25 questions, we will give Raspberry Pi 3 from the DIY community of Mail.Ru Group. There is also an interim prize: the first to go through the 15th level, will receive an invite from me on Habr.

    How to pass:

    - Login and password during registration are needed to continue the game on another computer;
    - The puzzle consists of 25 levels. At each level, you need to find out (find or calculate) the secret word and enter it in the input field at the top;
    - Often there are clues at the level , but sometimes the opposite is too much distracting information. Tips are often hidden. Do not forget to look into the HTML code of the page;
    - To complete the game, you need an initial knowledge of web-technologies, computer science, to know what ASCII, RGB and the number system are. In principle, being a programmer is not necessary. (-:
    - It is unlikely to succeed on a mobile or tablet, because you will most likely need some kind of text and graphic editor.
    - All tasks can be solved “on a piece of paper” without programming, but, of course, solved with nobody forbids the program.

    Ask questions in the comments. Belatedly, I congratulate all those involved in the programmer's day!

    UPD:
    1) There is no mistake in task 6! Carefully study the condition.
    2) In the 24th there was an error in the condition, it was fixed.

    UPD2:
    An invite left DeniSix in the 38th minute.
    Raspbery Pi receives Dr_XaoS (time 1:37).
    All the rest passed automatically added to the board of honor!

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