This Map has been created by B2B Contact Marketing Limited, of course based in UK. As complex as it is, I have some doubts about its usability in real marketing brainstorming.

If the marketing strategies on the island are so detailed and complicated as the tube map in London, the same association with the Bulgarian marketing and the underground map in Sofia really matches the reality. Genius idea! I hope we will have at least the second line in the next 5 years. Until then better follow this map.