When the applications for the Ghost Patrol game started appearing, it was pretty humbling. New videos kept showing up on YouTube. The videos... the videos made me glad that my team (Mystic Ghosti) had submitted a cryptic crossword puzzle instead of a video. There was some tough competition.
One video was an advertisement for the Ghostatron 5000, a "ghost capturing device" oddly reminiscent of a Pac-man game. Embedded in the video was a not-so-secret message "number of dots". There was also the URL of a page allowing you to purchase a Ghostatron 5000--but only if you entered the correct password into a little web form. Aha, no doubt the password was the number of dots. But, uhm, what number of dots? Number of dots in a Pac-man layout? Number of dots in a Seurat painting?
I figured it was probably the number of dots in a Pac-man game. I tried counting those. I counted them a couple of times, got a couple of answers. I tried counting a third time as a tie-breaker--and got a third answer. Counting dots was too hard for my puny puny brain. I wasn't even sure I was on the right track. It was time to think about brute force.
In trying out some previous guesses, I had some idea of how the password checker worked. If you entered the guess "able", then the password checker would put you on the page http://www.princeton.edu/~bdbennet/able.html . Since there was no such web page, I figured "able" was not the password. Peeking at the form page's source code confirmed that this was what was going on:
To test the hypothesis that the password was a "number of dots", I could check the pages
So I threw together a program to check those. Well, not all possible numbers. There are many numbers. I just checked the numbers from 1...999:
import time import urllib for count in range(1, 1000): time.sleep(1) # wait a second, in case princeton.edu is too puny to handle a robot (unlikely) u = urllib.urlopen("http://www.princeton.edu/~bdbennet/%d.html" % count) for line in u.readlines(): if line.find("<TITLE>404 Not Found</TITLE>") > -1: # if no such page print count, # print status if not count % 10: print break else: # but if page found print print "HEY" # say HEY print count break
My program never said HEY. So I was on the wrong track. I never got on the right track. I never solved that puzzle.
Labels: programming, puzzlehunts