[Puzzle] Ciphers - we all find 'em hardish [Ended, Solutions]

So I made a puzzle about different ciphers:
http://itstoohard.com/puzzle/NlLGDWwx

No CV required, ends next Wednesday. The game is bundle game, but solve the puzzle to find out which one.

Hopefully it works, as I encrypted many of the puzzles by hand so be ready for typos :P

It shouldn't be too hard after the hints appear.

Like every other current puzzle, I also made this because of this.

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There was two character typo in Q5 (the decrypted message was still mostly readable) corrected cipher: tybgbgvdgqswnvliwmgfgckubvqkli 1999.

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Solutions:

1: This was just about googling. Mary, Queen of Scots had sky terrier and plotted against Queen Elizabeth. She didn't use good enough cipher and was decapitated as punishment. The plot was called: Babington Plot. There was also some alternative allowed answers like "plot to assassinate Elizabeth" with different punctuations.

2: Count the letters. There are 25 of them, so we can write this message as 5x5 letter square. Rotating the square gives "who is clark kent not superman". Here people had little problems with the ending. I meant it just to mean that superman is not the right answer as a word but superman person is still the one we are looking for. The right answer was Kal-El, which is his birth name on planer krypton.

3: The hint is written in Hexa-decimal and asks to guess number between 1-10. The right guess is Octal number system (base 8). Decoding the message gives "511044N14935W", which is map coordinate located near stone henge. stone henge was the right answer.

4: This was Gold-bug cipher by Edgar Allan Poe. It is simple substitution cipher. The partial key is easy to find. For whole key one must either guess or find the whole key. The cipher tools I posted as hint had the whole key. Decrypted message as: "Marvel Comics goldbug firts appearance march of what year" which can be found from wikipedia. The answer was 1977. As side note the hint was excerpt from Poe's poem and also mentioned golden bowl which is kinda like golden bug :P

5: This was Playfair cipher. There was unfortunate typo in it that I corrected here in the OP. Personally I encrypted it by hand using the wikipedia. It is possible to decrypt it with same rules, or by using online decrypters. The key that was meant to be used was "TV quiz jock, Mr. PhD, bags few lyn" (so the given key without x). Decrypted message reads as: "uefafairplaywinqerassociationq". Here the Q is letter doubler letter, so it reads:
"UEFA fair play winner association 1999". Again this can be found from wikipedia, the answer was: scotland.

6: This was two letter substitution cipher invented by Della Porta. Simply putting "Della Porta Cipher" in google's image search should give the key. Using the key gives: "when della Porta released this work". This is maybe little mystic question, but reading the wikipedia article about Della Porta tells that this cipher was released in his work "De Furtivis Literarum Notis" which was released in 1563 and that year is the answer.

Solving all 6 questions gives another cipher as a answer (go solve it if you want to see it). Those 5 numbers are all prime numbers, looking from any table of prime numbers what n'th prime they are. Like 661 is 121st prime. Those numbers are then just basic decimal encryption. Giving the right letter to giveaway.