@Aissen It's hard to reverse engineer (but not _too_ hard), it has a bunch of interesting technical tricks, the code does something actually interesting and novel, and it's well paced to RE (you are super lost until you discover something small that you can anchor off of, then a bunch of other puzzle pieces fall into place... multiple times!).
Even without the thrill it would make an _excellent_ RE CTF challenge, but the thrill only adds to it!
Gregory's Server
@Aissen It's hard to reverse engineer (but not _too_ hard), it has a bunch of interesting technical tricks, the code does something actually interesting and novel, and it's well paced to RE (you are super lost until you discover something small that you can anchor off of, then a bunch of other puzzle pieces fall into place... multiple times!).
Even without the thrill it would make an _excellent_ RE CTF challenge, but the thrill only adds to it!