* @param tile unused

 * @param flags operation to perform

 * @param p1 the difficulty setting being changed. If it is -1, the difficulty level

 *           itself is changed. The new value is inside p2

 * @param p2 new value for a difficulty setting or difficulty level

 */

CommandCost CmdChangeDifficultyLevel(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)

{

	if (p1 != (uint32)-1L && ((int32)p1 >= GAME_DIFFICULTY_NUM || (int32)p1 < 0)) return CMD_ERROR;

	if (flags & DC_EXEC) {

		if (p1 != (uint32)-1L) {

			_opt_ptr->diff_level = 3; // custom difficulty level

		} else {

			_opt_ptr->diff_level = p2;

		}

		/* If we are a network-client, update the difficult setting (if it is open).

		 * Use this instead of just dirtying the window because we need to load in

		 * the new difficulty settings */

		if (_networking && !_network_server && FindWindowById(WC_GAME_OPTIONS, 0) != NULL)

			ShowGameDifficulty();

	}

	return CommandCost();