I came accross this very interesting blog that talks about map generation in regards to Tunnels of Doom.
It's actually 2 articles and fun to read. Apparently this guy got in contact with the original Tunnels of Doom programmer.
Tunnels of Doom! http://www.wp.me/pizxv-65
Coding maps (part 1) http://www.wp.me/pizxv-W9
and for the nerds among us: http://hbfs.wordpress.com













