SortSpeedsModified.cs

        public static List<LevelSpeed> SortSpeedsModified(List<LevelSpeed> list) {
            List<LevelSpeed> unsorted = new List<LevelSpeed>(list);
            List<LevelSpeed> sorted = new List<LevelSpeed>();
            unsorted.Sort((speed1, speed2) => speed1.offset.CompareTo(speed2.offset));

            int direction = 0;
            for(int i = 0; i < unsorted.Count; i++) {
                if(unsorted[i].offset == 0) {
                    direction = Math.Sign(unsorted[i].speed);
                    sorted.Add(unsorted[i]);
                    unsorted.RemoveAt(i);
                    break;
                }
            }
            while(unsorted.Count > 0) {
                if(direction == 0) break;
                if(direction == -1) direction = 0;
                if(direction >= unsorted.Count) break;

                sorted.Add(unsorted[direction]);
                int newDirection = Math.Sign(unsorted[direction].speed);
                unsorted.RemoveAt(direction);
                direction = newDirection;
            }
            sorted.Add(unsorted[0]);
            unsorted.RemoveAt(direction);

            return sorted;
        }