Easiest to read Game Source Code you've ever seen. This compiles
  to an interactive game using Inform7, which I am just starting
  working with.

  ''Cave Entrance''

  The Cobble Crawl is a room. ''You are crawling over cobbles in a
  low passage. There is a dim light at the east end of the
  passage.''

  A wicker cage is here. ''There is a small wicker cage discarded
  nearby.''

  The Debris Room is west of the Crawl. ''You are in a debris room
  filled with stuff washed in from the surface. A low wide passage
  with cobbles becomes plugged with mud and debris here, but an
  awkward canyon leads upward and west. A note on the wall says,
  'Magic word XYZZY'.''

  The black rod is here. ''A three foot black rod with a rusty
  star on one end lies nearby.''

  Above the Debris Room is the Sloping E/W Canyon. West of the
  Canyon is the Orange River Chamber.