tubechallenge.com

The biggest problems it has are (1) it's not likely to throw up a big variety of possible routes and (2) it's horribly repetitive.

Here's my idea:

At the start station, instead of a list of stations in an envelope, the BERC reads out the list of stations, which you write down with a sharpened pencil (provided). Every time you visit a station, you poke yourself in the eye with said pencil. This makes it increasingly hard to read the remainder of the list. Left or right eye is to be poked according to whether the visited station is a sub-surface or deep level station.

NR Single operator only (probably SE, SN, or SWT, maybe TL as well) and 15 stations Z1-? (? depending on length). Must visit on that operator. If its SN we may need to stop anything on the MKC comes out unless we start it at say Harrow or Wembley? (could still go via EUS)