diff --git a/csharp-scrabble-challenge.Main/Program.cs b/csharp-scrabble-challenge.Main/Program.cs
index 3751555..66c27cf 100644
--- a/csharp-scrabble-challenge.Main/Program.cs
+++ b/csharp-scrabble-challenge.Main/Program.cs
@@ -1,2 +1,26 @@
 // See https://aka.ms/new-console-template for more information
-Console.WriteLine("Hello, World!");
+
+
+
+
+using csharp_scrabble_challenge.Main;
+
+void main()
+{
+    string userInput = "";
+    var scrabbleApp = new Scrabble(userInput);
+    Console.WriteLine("Hello, Scrabbler!");
+    while (userInput != "/q")
+    {
+        
+        Console.WriteLine("Type a word, press enter, get score. (/q to quit)");
+        userInput = Console.ReadLine();
+        Console.Clear();
+
+        scrabbleApp.setWord(userInput);
+        Console.WriteLine($"`{userInput}` gives: {scrabbleApp.score()} points!");
+    }
+}
+
+
+main();
\ No newline at end of file
diff --git a/csharp-scrabble-challenge.Main/Scrabble.cs b/csharp-scrabble-challenge.Main/Scrabble.cs
index c1ea013..1bf2f24 100644
--- a/csharp-scrabble-challenge.Main/Scrabble.cs
+++ b/csharp-scrabble-challenge.Main/Scrabble.cs
@@ -4,20 +4,120 @@
 using System.Reflection.Metadata.Ecma335;
 using System.Text;
 using System.Threading.Tasks;
+using System.Text.RegularExpressions;
 
 namespace csharp_scrabble_challenge.Main
 {
     public class Scrabble
     {
+        private int _score = 0;
         public Scrabble(string word)
-        {            
-            //TODO: do something with the word variable
+        {
+            // seperating defining of word and class allows for change of word later...
+            setWord(word);
+        }
+
+        private void findAndCalc_doubleLetters(string word, ref int tempScore, ref string stripMultiplierWord)
+        {
+            // regex looks for a single letter with braces around it
+            var doubleLetters = Regex.Matches(word, $"{{[a-z]}}", RegexOptions.IgnoreCase);
+            foreach (Match d in doubleLetters)
+            {
+                stripMultiplierWord = stripMultiplierWord.Replace(d.Value, "");
+                tempScore += this.calc_score(d.Value) * 2;
+            }
+        }
+
+        private void findAndCalc_trippleLetters(string word, ref int tempScore, ref string stripMultiplierWord)
+        {
+            // regex looks for a single letter with brackets around it
+            var trippleLetters = Regex.Matches(word, $"\\[[a-z]\\]", RegexOptions.IgnoreCase);
+            foreach (Match t in trippleLetters)
+            {
+                stripMultiplierWord = stripMultiplierWord.Replace(t.Value, "");
+                tempScore += this.calc_score(t.Value) * 3;
+            }
+        }
+
+        private static string _checkWordMultiplier(string in_word, out int trippleWord, out int doubleWord)
+        {
+            trippleWord = Regex.Count(in_word, $"^\\[[a-z{{}}\\]\\[]*\\]$", RegexOptions.IgnoreCase);
+            doubleWord = Regex.Count(in_word, $"^{{[a-z{{}}\\[\\]]*}}$", RegexOptions.IgnoreCase);
+            string retWord = in_word;
+            if (doubleWord != 0 || trippleWord != 0)
+            {
+                // If word has a multiplier, remove braces/bracets at edges
+                retWord = in_word[1..(in_word.Length - 1)];
+            }
+            // return word without braces/brackets...
+            return retWord;
+        }
+
+        private int calc_score(string word)
+        {
+            var score_1_matchCount = Regex.Count(word, "(A|E|I|O|U|L|N|R|S|T)", RegexOptions.IgnoreCase);
+            var score_2_matchCount = Regex.Count(word, "(D|G)", RegexOptions.IgnoreCase);
+            var score_3_matchCount = Regex.Count(word, "(B|C|M|P)", RegexOptions.IgnoreCase);
+            var score_4_matchCount = Regex.Count(word, "(F|H|V|W|Y)", RegexOptions.IgnoreCase);
+            var score_5_matchCount = Regex.Count(word, "(K)", RegexOptions.IgnoreCase);
+            var score_8_matchCount = Regex.Count(word, "(J|X)", RegexOptions.IgnoreCase);
+            var score_10_matchCount = Regex.Count(word, "(Q|Z)", RegexOptions.IgnoreCase);
+
+            return score_1_matchCount * 1 +
+                score_2_matchCount * 2 +
+                score_3_matchCount * 3 +
+                score_4_matchCount * 4 +
+                score_5_matchCount * 5 +
+                score_8_matchCount * 8 +
+                score_10_matchCount * 10;
         }
+        public void setWord(string word)
+        {
+            // Set default value, expect failure as default
+            this._score = 0;
+
+            // Handle edgecase
+            if (word.Length == 0)
+                return;
+
+            
+
+            int tempScore = 0;
+            string stripMultiplierWord = word;
+
+            // identify trippleLetters, doubleletters, remove occurances from stripMultiplierWord then sum to tempScore
+            findAndCalc_trippleLetters(word, ref tempScore, ref stripMultiplierWord);
+            findAndCalc_doubleLetters(word, ref tempScore, ref stripMultiplierWord);
+
+            int trippleWord, doubleWord;
+            //word = _checkWordMultiplier(word, out trippleWord, out doubleWord);
+            word = _checkWordMultiplier(stripMultiplierWord, out trippleWord, out doubleWord);
 
+            // if stripMultiplierWord contains anything but letters, then the input word was invalid
+            var invalidInputCount = Regex.Count(word, "([^a-z])", RegexOptions.IgnoreCase);
+            if (invalidInputCount != 0)
+                return;
+
+            // calculate score for the remaining letters and add to tempScore
+            tempScore += calc_score(word);
+
+
+            // Finally add any word multipliers
+            if (doubleWord != 0)
+                tempScore *= 2;
+            else if (trippleWord != 0)
+                tempScore *= 3;
+            
+
+            // Apply score
+            this._score = tempScore;
+        }
         public int score()
         {
             //TODO: score calculation code goes here
-            throw new NotImplementedException(); //TODO: Remove this line when the code has been written
+            // ^ Score is now calculated when Scrabble instance is created
+            return this._score;
+
         }
     }
 }
diff --git a/csharp-scrabble-challenge.Test/CoreTests.cs b/csharp-scrabble-challenge.Test/CoreTests.cs
index f42e402..0ea4db2 100644
--- a/csharp-scrabble-challenge.Test/CoreTests.cs
+++ b/csharp-scrabble-challenge.Test/CoreTests.cs
@@ -12,9 +12,24 @@ public class CoreTests
         [TestCase("\n\r\t\b\f", 0)]
         [TestCase("a", 1)]
         [TestCase("f", 4)]
+        [TestCase("{f}", 8)]
+        [TestCase("[f]", 12)]
         [TestCase("OXyPHEnBUTaZoNE", 41)]
         [TestCase("quirky", 22)]
         [TestCase("street", 6)]
+        [TestCase("[{h}o1s{e}]", 0)] // error case (zero for errors)
+        [TestCase("{h}ous{e}", 13)]
+        [TestCase("[{h}ous{e}]", 39)]
+        [TestCase("[h}ous{e}]", 0)] //Error case (zero for errors)
+        [TestCase("[{h}ous{e}}]", 0)] //Error case (zero for errors)
+        [TestCase("[{{h}ous{e}]", 0)] //Error case (zero for errors)
+        [TestCase("[E}ous{E}]", 0)] //Error case (zero for errors)
+        [TestCase("]{E}ous{E}]", 0)] //Error case (zero for errors)
+        [TestCase("]{E}ous{E}[", 0)] //Error case (zero for errors)
+        [TestCase("[{E}ous{E}[", 0)] //Error case (zero for errors)
+        [TestCase("[{d}a[d]]", 33)] //Error case (zero for errors)
+        [TestCase("[{d}[d]]", 30)] //Error case (zero for errors)
+
         public void WordScoreTests(string word, int targetScore)
         {
             Assert.AreEqual(this.GetWordScore(word), targetScore);