All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Algorithms
The great tunnel switch II (Posted on 2008-12-26) Difficulty: 3 of 5
There are 4 doors to the secret Truth Club room, each one at the end of a tunnel leading there. Each of the members has a keycard to a different door. All the doors are unlocked from the inside, but to enter from the outside, one needs to swipe the door's keycard to open the door for a few seconds.

You have found a copy of one of these cards, and want to prove beyond a reasonable doubt to the club members that you can unlock one of the doors, however, you don't want to expose to anyone whose door it is. What can you do to show this? (preferably with no additional materials, and without anybody else inside the cave/tunnels)

(Assume the club members are honorable enough to follow their part of the plan you propose.)

Here is a map of the tunnels:

A map of the tunnels

No Solution Yet Submitted by Gamer    
No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
another possible solution? Comment 9 of 9 |
Club members should stay outside the main entrance of the cave/tunnels until I'm inside the Truth Club Room not to see which is the tunnel/door I used to enter.

Once I'm in (eg after the time the above step requires) they should 
take position at the entrances of the tunnels.

I just need to open more than one door (at least 2, even at different times) and shout to demonstrate to the club members that I've access to the room. If I wasn't inside they could only hear my voice comes from one tunnel only.

  Posted by Marco on 2014-08-08 10:09:20
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (3)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2017 by Animus Pactum Consulting. All rights reserved. Privacy Information