code: public void start() throws SlickException {
  		try {
  			setup();
  			
  			getDelta();
  			while (running()) {
  				gameLoop();
  			}
  		} finally {
  			destroy();
  		}
  		
  		if (forceExit) {
  			System.exit(0);
  		}
  	}
docs: Start running the game
  
  @throws SlickException Indicates a failure to initialise the system