diff --git a/Lottery/Generator.cs b/Lottery/Generator.cs
index c399367..fcd57bf 100644
--- a/Lottery/Generator.cs
+++ b/Lottery/Generator.cs
@@ -2,6 +2,11 @@
 {
     internal class Generator
     {
+        /// <summary>
+        /// Simple algorithm for generating a list of unique numbers of Limits.Count size
+        /// </summary>
+        /// <param name="Limits">Defines the amount of numbers to generate, the max and min values</param>
+        /// <returns>The list of numbers is returned sorted in ascending order.</returns>
         public static List<int> Generate(Limits Limits)
         {
             List<int> Candidates = Enumerable.Range(Limits.Lower, Limits.Upper).ToList();
diff --git a/Lottery/Lottery.cs b/Lottery/Lottery.cs
index 13671a4..11f3a5a 100644
--- a/Lottery/Lottery.cs
+++ b/Lottery/Lottery.cs
@@ -1,14 +1,33 @@
 namespace Lottery
 {
-    internal class Lottery(Limits limits)
+    internal record Limits(int Count, int Lower, int Upper);
+
+    /// <summary>
+    /// Abstract base class for lotteries.
+    /// </summary>
+    internal class Lottery
     {
-        protected Limits Limits => limits;
+        protected virtual Limits Limits => throw new NotImplementedException();
         public virtual string Play() => $"Numbers: {string.Join(", ", Generator.Generate(Limits))}";
     }
 
-    internal class LotteryWithSpecial(Limits limits, Limits specialLimits) : Lottery(limits)
+    /// <summary>
+    /// Concrete UKLotto Lottery class.
+    /// Generates six balls from 1 to 59.
+    /// </summary>
+    internal class UKLottoLottery : Lottery
     {
-        protected Limits SpecialLimits => specialLimits;
+        protected override Limits Limits { get; } = new(Count: 6, Lower: 1, Upper: 59);
+    }
+
+    /// <summary>
+    /// Abstract base class for Lotteries with Special values.
+    /// It subclasses Lottery.
+    /// SpecialLimits and SpecialIdentifier properties must be overridden.
+    /// </summary>
+    internal class LotteryWithSpecial : Lottery
+    {
+        protected virtual Limits SpecialLimits => throw new NotImplementedException();
         protected virtual string SpecialIdentifier => throw new NotImplementedException();
 
         public override string Play()
@@ -20,18 +39,36 @@
         }
     }
 
-    internal class EuroMillionsLottery(Limits limits, Limits specialLimits) : LotteryWithSpecial(limits, specialLimits)
+    /// <summary>
+    /// Concrete class for EuroMillions lottery.
+    /// Generates five balls from 1 to 50 and two lucky stars from 1 to 12.
+    /// </summary>
+    internal class EuroMillionsLottery : LotteryWithSpecial
     {
+        protected override Limits Limits { get; } = new(Count: 5, Lower: 1, Upper: 50);
+        protected override Limits SpecialLimits { get; } = new(Count: 2, Lower: 1, Upper: 12);
         protected override string SpecialIdentifier => "Lucky Stars";
     }
 
-    internal class SetForLifeLottery(Limits limits, Limits specialLimits) : LotteryWithSpecial(limits, specialLimits)
+    /// <summary>
+    /// Concrete class for SetForLifeLottery lottery.
+    /// Generates five balls from 1 to 47 and one life ball from 1 to 10.
+    /// </summary>
+    internal class SetForLifeLottery : LotteryWithSpecial
     {
+        protected override Limits Limits { get; } = new(Count: 5, Lower: 1, Upper: 47);
+        protected override Limits SpecialLimits { get; } = new(Count: 1, Lower: 1, Upper: 10);
         protected override string SpecialIdentifier => "Life Ball";
     }
 
-    internal class ThunderballLottery(Limits limits, Limits specialLimits) : LotteryWithSpecial(limits, specialLimits)
+    /// <summary>
+    /// Concrete class for ThunderballLottery lottery.
+    /// Generates fives balls from 1 to 39 and one thunderball from 1 to 14.
+    /// </summary>
+    internal class ThunderballLottery : LotteryWithSpecial
     {
+        protected override Limits Limits { get; } = new(Count: 5, Lower: 1, Upper: 39);
+        protected override Limits SpecialLimits { get; } = new(Count: 1, Lower: 1, Upper: 14);
         protected override string SpecialIdentifier => "Thunderball";
     }
 }
diff --git a/Lottery/MainPage.xaml.cs b/Lottery/MainPage.xaml.cs
index 18ea968..e619e51 100644
--- a/Lottery/MainPage.xaml.cs
+++ b/Lottery/MainPage.xaml.cs
@@ -1,14 +1,12 @@
 namespace Lottery
 {
-    internal record Limits(int Count, int Lower, int Upper);
-
     public partial class MainPage : ContentPage
     {
         readonly List<Lottery> Lotteries = [
-            new Lottery(limits: new Limits(6, 1, 59)), 
-            new EuroMillionsLottery(limits: new Limits(5, 1, 50), specialLimits: new Limits(2, 1, 12)), 
-            new SetForLifeLottery(limits: new Limits(5, 1, 47), specialLimits: new Limits(1, 1, 10)), 
-            new ThunderballLottery(limits: new Limits(5, 1, 39), specialLimits: new Limits(1, 1, 14))
+            new UKLottoLottery(), 
+            new EuroMillionsLottery(), 
+            new SetForLifeLottery(), 
+            new ThunderballLottery()
         ];
         const KindOfLottery DefaultLottery = KindOfLottery.Uk;
         Lottery Lottery;