Download the example here

You'll get a directory named HTW2 that contains FitNesseRoot and HTW.
The FitNesseRoot directory contains the acceptance tests for the Hunt The Wumpus game. You'll need to start fitnesse and point it to this directory.

java -cp <pathToFitnesse>/fitnesse.jar fitnesse.FitNesse -d pathOfZipFile/HTW2 -r FitNesseRoot

There are some !path statements to change in there..

The HTW directory contains all the source (and binary) code, including unit tests.