Natas1
Website URL: http://overthewire.org/wargames/natas/natas1.html
Let’s look at the data provided to us.
Username: natas1
URL: http://natas1.natas.labs.overthewire.org
Let’s log into the Natas0 .

Okay, so, upfront, I’m unable to see anything resembling a password. Let’s checkout the source code.
Voila! The password is given in the source code.