// Create game or reset it if necessary
String resetStr = req.getParameter(PARAM_RESET_KEY);
if ((game == null) || (resetStr != null)) {
// TODO use dependency injection to avoid dependency on implementation
game = GAME_FACTORY.createGame();
game.begin();
}
// Handle play parameter
String subMessage = "";
String colStr = req.getParameter(PARAM_PLAY_KEY);