tubechallenge.com

Here is another new challenge (maybe?)
Has the all lines challenge been attempted in alphabetical order; ie
Bakerloo, Central, Circle, District, East London, Hammersmith & City, Jubilee, Metropolitan, Northern, Piccadilly, Victoria, Waterloo & City (when open later in year)....What would the interest be in this challenge

It's been suggested, don't think it's actually been done.
http://www.tubechallenge.com/forum/viewtopic.php?t=289

I seem to remember from when I worked out a route that it's a bit too messy to be fun...