The project is uses IcedCoffeeScript, which you have to install first in case you haven't already played with that awesome language extension.

$ npm install iced-coffee-script -g

Switch to the project home dir and enter:

$ npm install

$ cd ../hackerpursuit
$ cp config.example.coffee config.coffee

Mabe you should ask someone to get a valid config file. Saves you a lot of time ;)
Make sure that 'exports.game.questionsPath' is set to the questions directory of the repo that you cloned in the last step.

Open a new shell and fire up redis:

$ redis-server

$ iced server.coffee

BOOM! Like a bows!