The Tube Challenge involves traveling to every station on the London Underground in the fastest time possible.
What is the record time to the nearest hour?
Stations on multiple lines only need to be visited once, and participants can walk between stations or take buses, but cannot use private transport.
Remember, the first new player to comment with the correct answer wins a free drink at their nest iQ Trivia show.
The record has been set and broken many times, and currently sits at 16 hours, 14 minutes, 10 seconds.
There’s a helpful article explaining how to do it here: http://www.telegraph.co.uk/travel/travelnews/11174269/How-to-do-the-Tube-Challenge.html It contains more running than you might think, and it’s brought out all the Tube nerds to argue about the rules.