N0x0ss: Well I did figure out the square thing... but the substraction thing :s .... nada
NameGoo: You seem to be pretty close, although I don't know how you managed to get this:
"16 24 20 22 57 63 30 1 27 13 66 20 43 76 40 58 69 65 -9 36 41 17 39 53 45 4 -27 75 6 74 42 35 85 15 49 30 67 57 15 "
There shouldn't be any numbers in the negative, and all numbers need 2 digits to be converted back into letters.
BTW, the second key is 27 letters too short. Perhaps it can be repeated?
Wow, thanks for this puzzle and the games! Just redeemed the key. I figured out yesterday before going to sleep how to do the square and how the numbers would fit with it. But I thought I was on the wrong track because they were just too high (so this hint of you was the missing piece) and too many (resolved itself...). Didn't think of the numbers of the code being as text in there. ;-)