anchor.diff:      final params = request.context;
       final TheHundredClient theHundredClient = params[param.THE_HUNDRED_CLIENT];
       final SlackClient slackClient = params[param.SLACK_CLIENT];
  -    final option = params[param.SLACK_TEXT];
  +    final String options = params[param.SLACK_TEXT];
       final username = params[param.SLACK_USERNAME];
  -    if (option == _OPTION_HELP) {
  +    final optionList = options.split(new RegExp(r'\s+'));
  +    if (optionList.first == _OPTION_HELP) {
         _log.info('@$username needs help');
         return createTextResponse('View upcoming gaming sessions', private: true);
       }
  +    final shouldFilter = optionList.last == _OPTION_FILTER;
  +    final platform = _extractPlatform(optionList.first);
       _log.info('@$username looking up games');
       final games =
  -        _filterByPlatform(await theHundredClient.getAllGames(), option);
  +        _filterByPlatform(await theHundredClient.getAllGames(), platform);
       _log.info('${games.length} game(s)');
       games.forEach(_log.info);
       if (games.isEmpty) {
  
positive.code: const _OPTION_HELP = 'help';
  const _OPTION_XBL = 'xbl';
  const _OPTION_PSN = 'psn';
  
  const _COLORS = const ['#4285f4', '#f4b400', '#0f9d58', '#db4437'];
  
  /// Exposes LFG functionality.
  class LfgHandler extends SlackCommandHandler {
  
negative.code:         timezone != null ? getLocation(timezone) : theHundredClient.location;
      final now = new TZDateTime.now(location);
      final attachments = new Iterable.generate(games.length)
          .map((index) => _generateAttachment(games, index, now, shouldFilter))
          .toList();
      return createAttachmentsResponse(attachments);
    }
  
    /// Filters games by platform based on user input.
    List<Game> _filterByPlatform(List<Game> games, _Platform platform) {
      switch (platform) {
        case _Platform.xbox:
          _log.info('Focusing on Xbox');
          return games.where((game) => game.platform == Platform.xbox).toList();
        case _Platform.playstation:
          _log.info('Focusing on Playstation');
          return games
              .where((game) => game.platform == Platform.playstation)
              .toList();
        default:
          return games;
      }
    }
  
    /// Generates an attachment representing a game.
    Map _generateAttachment(
        List<Game> games, int index, TZDateTime now, bool shouldFilter) {
      final game = games[index];
      final result = {};
      final date =
  