While playing around with my bot, I found out this mysterious transaction:
[...]
The prize would be ~32 BTC

EDIT: If you find the solution feel free to leave a tip

1DPUhjHvd2K4ZkycVHEJiN6wba79j5V1u3
Started to anaylize this, but figured out its not actually a puzzle at all. Its attempt to steal of this funds right? There is no official puzzle by owner of this addresses? By what you saying i think there is no consent here.
From what i see you guys have fun, but it shouldn't be allowed at all

You are right mate, their is no statement about the address owner to have a contest in that address. Its looks like they hacking that account rather than a contest. Well they are having fun and we can see that Bitcoin address are really that strong to crack. The OP started this 4years ago and too many people try to crack the address but no one did it yet for so long.