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a guest Aug 1st, 2014 12,910 Never
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  1. BF4 passcode level3
  2.  
  3. 1. Grab the symbols from the map (the hexagrams, not the trigrams)
  4. 2. From jjju's barcode int, people mapped those to unicode values: 0x4dc0, 0x4dc0, 0x4dc1, 0x4dc2, 0x4dc4, 0x4dc7, 0x4dcc, 0x4dd4
  5. 3. People also mapped those to the fibonacci sequence (with the value those symbols have in chinese mythology or something): 1 1 2 3 5 8 13 21. This gives us an order. Now it turns out you need to take them from largest to smallest, and I got this idea from the battle log console that references the 'max' function.
  6. 4. jjju's formula was pretty explicit showing we were looking for a polynomial, it was missing mostly which value to use as factor and where to start end.
  7. 5. Today's graph picture shows a function that 1) tends to -inf when evaluated at -inf and tends to inf when evaluated at inf. This tells us that the highest x power is odd.  2) It doesn't cross the origin. And when you look at the graph and evaluates what's the function value is at the origin, you get a value between 19000 and 20000. This is exactly the range of value of the unicode char. This also tells us that the polynomial has a x^0 term. We have 8 unicode values that map from x^0 to x^7
  8. 6. From a chat in game from another dev, we had 'X marks the spot' and 'the greek X', which people assumed was related to the console saying CHI = 7.25154120937236. So this gives us the point to evaluate at. The console also mentions the 'floor' function which tells us to ignore the decimal part of the result.
  9.  
  10. In the end :
  11.  
  12. f = 19924 * x^0 + 19916 * x^1 + 19911 * x^2 + 19908 * x^3 + 19906 * x^4 + 19905 * x^5 + 19904 * x^6 + 19904 * x^7
  13.  
  14. f(7.25154120937236) = 24344241893.00018
  15.  
  16. => passcode = 24344241893
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