Visit Tor onion website to register.
You need the TorBrowser as HackTown is only available on Tor.
Download TorBrowser below.

Then visit HackTown
http://hacktowns3sba2xavxecm23aoocvzciaxirh3vekg2ovzdjgjxedfvqd.onion
You can confirm HackTown Tor onion:
http://dreadytofatroptsdj6io7l3xptbet6onoyno2yv7jicoxknyazubrad.onion/d/HackTown
http://torliysnrwwxsdn452jys2ujn75zmrd75j53zlssnfnifr5ny4rupkid.onion
https://daunt.link/view/HackTown