It's not difficult, really
And you don't even need GPUs or fast PC.
- None of the Endo/Sym points are below 53 bits
- None of the Endo/Sym points are within 30 bits of the bit boundary from 1 to 256
- None of the Endo/Sym points are a hash of "Mini-puzzle #4" or "RetiredCoder Mini-puzzle #4"
- None of the Endo/Sym points are a close to the privatekey or K or previous #3 Puzzle
- C'mon Guys. do it fast. What else...