diff --git a/csharp-scrabble-challenge.Main/Program.cs b/csharp-scrabble-challenge.Main/Program.cs
index 3751555..f654986 100644
--- a/csharp-scrabble-challenge.Main/Program.cs
+++ b/csharp-scrabble-challenge.Main/Program.cs
@@ -1,2 +1,17 @@
 // See https://aka.ms/new-console-template for more information
-Console.WriteLine("Hello, World!");
+using csharp_scrabble_challenge.Main;
+Console.WriteLine("Welcome to Scrabble!");
+
+
+while (true)
+{
+    Console.WriteLine("Write a Scrabble-word to get it's score(q to quit):");
+    string input = Console.ReadLine();
+    if (input == "q")
+    {
+        break;
+    }
+
+    Scrabble scrabble = new Scrabble(input);
+    Console.WriteLine(scrabble.score());
+}
\ No newline at end of file
diff --git a/csharp-scrabble-challenge.Main/Scrabble.cs b/csharp-scrabble-challenge.Main/Scrabble.cs
index c1ea013..f39cc2b 100644
--- a/csharp-scrabble-challenge.Main/Scrabble.cs
+++ b/csharp-scrabble-challenge.Main/Scrabble.cs
@@ -9,15 +9,104 @@ namespace csharp_scrabble_challenge.Main
 {
     public class Scrabble
     {
+        private  Dictionary<char, int> _scores = new Dictionary<char, int> 
+        {
+            {'a', 1},
+            {'b', 3},
+            {'c', 3},
+            {'d', 2},
+            {'e', 1},
+            {'f', 4},
+            {'g', 2},
+            {'h', 4},
+            {'i', 1},
+            {'j', 8},
+            {'k', 5},
+            {'l', 1},
+            {'m', 3},
+            {'n', 1},
+            {'o', 1},
+            {'p', 3},
+            {'q', 10 },
+            {'r', 1},
+            {'s', 1},
+            {'t', 1},
+            {'u', 1},
+            {'v', 4},
+            {'w', 4},
+            {'x', 8},
+            {'y', 4},
+            {'z', 10},
+            {'{', 0},
+            {'}', 0},
+            {'[', 0},
+            {']', 0}
+        };
+        private string _word = "";
+        private bool OnlyHasValidChars(string str)
+        {
+            string lowerStr = str.ToLower();
+            foreach (char c in lowerStr)
+            {
+                if (!_scores.ContainsKey(c))
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+
         public Scrabble(string word)
-        {            
+        {
+            _word = word;
             //TODO: do something with the word variable
         }
 
         public int score()
         {
+            int _score = 0;
+            int _multiplier = 1;
+            int _balanced_curly = 0;
+            int _balanced_square = 0;
+            char _opening_bracket = ' ';
+
+
+            if (!OnlyHasValidChars(_word.ToLower())) { return 0; }
+            foreach(char c in _word.ToLower())
+            {
+                if (c == '{')
+                {
+                    _balanced_curly++;
+                    _multiplier *= 2;
+                    _opening_bracket = '{';
+                }
+                else if (c == '[')
+                {
+                    _balanced_square++;
+                    _multiplier *= 3;
+                    _opening_bracket = '[';
+                }
+                else if(c == ']')
+                {
+                    if (_multiplier%3 != 0 || _opening_bracket == '{') { return 0;}
+                    _balanced_square--;
+                    _multiplier /= 3;
+                    _opening_bracket = ' ';
+                    
+                }
+                else if (c == '}')
+                {
+                    if (_multiplier % 2 != 0  || _opening_bracket == '[') { return 0; }
+                    _balanced_curly--;
+                    _multiplier /= 2;
+                    _opening_bracket = ' ';
+
+                }
+                _score += _scores[c] * _multiplier;
+            }
+            if (_balanced_square != 0 || _balanced_curly != 0 || _multiplier != 1) { return 0; }
+            return _score;
             //TODO: score calculation code goes here
-            throw new NotImplementedException(); //TODO: Remove this line when the code has been written
         }
     }
 }
diff --git a/csharp-scrabble-challenge.Test/CoreTests.cs b/csharp-scrabble-challenge.Test/CoreTests.cs
index f42e402..b6330d6 100644
--- a/csharp-scrabble-challenge.Test/CoreTests.cs
+++ b/csharp-scrabble-challenge.Test/CoreTests.cs
@@ -6,6 +6,19 @@ namespace csharp_scrabble_challenge.Test
     [TestFixture]
     public class CoreTests
     {        
+        [TestCase("", 0)]
+        [TestCase(" ", 0)]
+        [TestCase(" \t\n", 0)]
+        [TestCase("\n\r\t\b\f", 0)]
+        [TestCase("a", 1)]
+        [TestCase("f", 4)]
+        [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("", 0)]
         [TestCase(" ", 0)]
         [TestCase(" \t\n", 0)]