diff --git a/csharp-scrabble-challenge.Main/Program.cs b/csharp-scrabble-challenge.Main/Program.cs
index 3751555..6290683 100644
--- a/csharp-scrabble-challenge.Main/Program.cs
+++ b/csharp-scrabble-challenge.Main/Program.cs
@@ -1,2 +1,18 @@
-// See https://aka.ms/new-console-template for more information
-Console.WriteLine("Hello, World!");
+
+
+using csharp_scrabble_challenge.Main;
+using System;
+
+Console.WriteLine("Welcome to Scrabble!");
+
+
+while (true)
+{   
+    Console.WriteLine("Write a word, or quit with qqq");
+    string input = Console.ReadLine();
+    Scrabble scrabble = new Scrabble(input);
+
+    if (input == "qqq") break;
+    Console.WriteLine($"{input} has score {scrabble.score()}");
+   
+}
diff --git a/csharp-scrabble-challenge.Main/Scrabble.cs b/csharp-scrabble-challenge.Main/Scrabble.cs
index c1ea013..1976c65 100644
--- a/csharp-scrabble-challenge.Main/Scrabble.cs
+++ b/csharp-scrabble-challenge.Main/Scrabble.cs
@@ -9,15 +9,133 @@ namespace csharp_scrabble_challenge.Main
 {
     public class Scrabble
     {
+
+        private Dictionary<char, int> value_of_letter;
+        private string _word;
+        private string numbers = "123456789"; 
+
+
         public Scrabble(string word)
         {            
             //TODO: do something with the word variable
+            _word = word.ToUpper();
+
         }
 
         public int score()
         {
             //TODO: score calculation code goes here
-            throw new NotImplementedException(); //TODO: Remove this line when the code has been written
+
+            int score = 0;
+
+            value_of_letter = new Dictionary<char, int>();
+
+            value_of_letter.Add('A', 1);
+            value_of_letter.Add('E', 1);
+            value_of_letter.Add('I', 1);
+            value_of_letter.Add('O', 1);
+            value_of_letter.Add('U', 1);
+            value_of_letter.Add('L', 1);
+            value_of_letter.Add('N', 1);
+            value_of_letter.Add('R', 1);
+            value_of_letter.Add('S', 1);
+            value_of_letter.Add('T', 1);
+
+            value_of_letter.Add('D', 2);
+            value_of_letter.Add('G', 2);
+
+            value_of_letter.Add('B', 3);
+            value_of_letter.Add('C', 3);
+            value_of_letter.Add('M', 3);
+            value_of_letter.Add('P', 3);
+
+            value_of_letter.Add('F', 4);
+            value_of_letter.Add('H', 4);
+            value_of_letter.Add('V', 4);
+            value_of_letter.Add('W', 4);
+            value_of_letter.Add('Y', 4);
+
+            value_of_letter.Add('K', 5);
+
+            value_of_letter.Add('J', 8);
+            value_of_letter.Add('X', 8);
+
+            value_of_letter.Add('Q', 10);
+            value_of_letter.Add('Z', 10);
+
+            bool isDobbel = false; 
+            bool isTrippel = false;
+ 
+            int multiplier = 1;
+            int count_start_sBrackets = 0;
+            int count_end_sBrackets = 0;
+            int count_start_cBrackets = 0;
+            int count_end_cBrackets = 0;
+          
+
+            for (int i = 0; i < _word.Length; i++)
+            {
+                char letter = _word[i];
+
+                // If the word contains a number
+                if (numbers.Contains(letter))
+                {
+                    break;
+                }
+
+                // Dobbel
+                if (letter == '{')
+                {
+                    isDobbel = true;
+                    multiplier = multiplier * 2;
+                    count_start_cBrackets++;
+                }
+                if (letter == '}')
+                {
+                    
+                    isDobbel = false;
+                    multiplier = multiplier / 2;
+                    count_end_cBrackets++;
+                }
+
+                // Trippel 
+                if (letter == '[')
+                {
+                    isDobbel = true;
+                    multiplier = multiplier * 3;
+                    count_start_sBrackets++;
+                }
+
+                if (letter == ']')
+                {
+                   
+                    isDobbel = false;
+                    multiplier = multiplier / 3;
+                    count_end_sBrackets++;
+                }
+
+                // Score 
+                if (value_of_letter.TryGetValue(letter, out int value))
+                {
+                    score += value * multiplier;
+                }
+                else
+                {
+                    score += 0;
+                }
+            }
+
+            // If the start brackets and end brackets are not equal - return 0
+            if (count_start_cBrackets != count_end_cBrackets)
+            {
+                return 0;   
+            }
+            if (count_start_sBrackets != count_end_sBrackets)
+            {
+                return 0;
+            }
+            return score;
+
         }
     }
 }
diff --git a/csharp-scrabble-challenge.Test/CoreTests.cs b/csharp-scrabble-challenge.Test/CoreTests.cs
index f42e402..6dd9dc7 100644
--- a/csharp-scrabble-challenge.Test/CoreTests.cs
+++ b/csharp-scrabble-challenge.Test/CoreTests.cs
@@ -5,7 +5,12 @@ namespace csharp_scrabble_challenge.Test
 {
     [TestFixture]
     public class CoreTests
-    {        
+    {
+        [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("{{a}", 0)]
         [TestCase("", 0)]
         [TestCase(" ", 0)]
         [TestCase(" \t\n", 0)]
@@ -17,7 +22,9 @@ public class CoreTests
         [TestCase("street", 6)]
         public void WordScoreTests(string word, int targetScore)
         {
-            Assert.AreEqual(this.GetWordScore(word), targetScore);
+            Scrabble scrabble = new Scrabble(word);
+
+            Assert.That(scrabble.score(), Is.EqualTo(targetScore));
         }
 
         private int GetWordScore(string word) => new Scrabble(word).score();