ScoreMaster.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Linq;

public static class ScoreMaster {

    public static List<int> ScoreFrames(List<int> rolls)
    {
        List<int> frameList = new List<int>();
            for (int i = 0; i < rolls.Count - 1; i+=2)
            {
                if (rolls[i] != 10)
                {
                    int total = rolls[i] + rolls[i + 1];
                    //Spare calculation
                    if (total == 10)
                    {
                        if (i + 2 < rolls.Count)
                        {
                            total += rolls[i + 2];
                        }
                        else
                        {
                            continue;
                        }
                    }
                    frameList.Add(total);
                }
                //Strikes
                if (rolls[i] == 10 && frameList.Count < 9)
                {
                    if (i + 2 < rolls.Count)
                    {
                        int total = rolls[i] + rolls[i + 1] + rolls[i + 2];
                        frameList.Add(total);
                        i--;
                        continue;
                    }
                    else
                    {
                        break;
                    }
                }
                //Last frame strike
                else if (rolls[i] == 10 && frameList.Count == 9)
                {
                    int total = rolls[i] + rolls[i + 1] + rolls[i + 2];
                    frameList.Add(total);
                    break;
                }
            }
        
        return frameList;
    }

    public static List<int> ScoreCumulative(List<int> rolls)
    {
        List<int> cumulative = new List<int>();
        int total = 0;
        foreach(int frameScore in ScoreFrames(rolls))
        {
            total += frameScore;
            cumulative.Add(total);
        }
        return cumulative;
    }


}