code: def register_game(game_name, game_mode="NoFrameskip-v4"):
    
    if game_name not in ATARI_GAMES:
      raise ValueError("Game %s not in ATARI_GAMES" % game_name)
    if game_mode not in ATARI_GAME_MODES:
      raise ValueError("Unknown ATARI game mode: %s." % game_mode)
    camel_game_name = misc_utils.snakecase_to_camelcase(game_name) + game_mode
    # Create and register the Problem
    cls = type("Gym%sRandom" % camel_game_name,
               (T2TGymEnv,), {"base_env_name": camel_game_name})
    registry.register_problem(cls)
docs: Create and register problems for the game.
  
    Args:
      game_name: str, one of the games in ATARI_GAMES, e.g. "bank_heist".
      game_mode: the frame skip and sticky keys config.
  
    Raises:
      ValueError: if game_name or game_mode are wrong.