/// <summary>
        /// Event called on map selection change.
        /// </summary>
        private void OnMapChange(IPlayableMap map)
        {
            ClearCells();
            if (map == null)
            {
                difficultyScale.Active = false;
            }
            else
            {
                var difficulty = map.Difficulty;
                if (difficulty == null)
                {
                    throw new ArgumentException($"Missing DifficultyInfo for specified map ({map.ToString()}). Perhaps it is not a playable map?");
                }

                SetupDifficulty(map, difficulty);
            }
        }