diff --git a/Ch4PizzaStore/Ch4PizzaStore.csproj b/Ch4PizzaStore/Ch4PizzaStore.csproj
new file mode 100644
index 0000000..46e6c92
--- /dev/null
+++ b/Ch4PizzaStore/Ch4PizzaStore.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net9.0</TargetFramework>
+        <LangVersion>latestmajor</LangVersion>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>
diff --git a/Ch4PizzaStore/Pizza.cs b/Ch4PizzaStore/Pizza.cs
new file mode 100644
index 0000000..31fb159
--- /dev/null
+++ b/Ch4PizzaStore/Pizza.cs
@@ -0,0 +1,70 @@
+namespace Ch4PizzaStore;
+
+public abstract class Pizza(string name, string dough, string sauce, List<string> toppings) {
+    public string Name { get; } = name;
+
+    internal void Prepare() {
+        Console.WriteLine($"Preparing {Name}");
+        Console.WriteLine($"Tossing {dough} dough...");
+        Console.WriteLine($"Adding {sauce} sauce...");
+        Console.WriteLine("Adding toppings:");
+        foreach (var topping in toppings) {
+            Console.WriteLine($"\t{topping}");
+        }
+    }
+
+    // While in Java all methods are by default `virtual`, C# is the same as C++,
+    // all methods are final/selaed until explicitly marked as virtual.
+    internal virtual void Bake() {
+        Console.WriteLine("Bake for 25 minutes at 350");
+    }
+
+    internal virtual void Cut() {
+        Console.WriteLine("Cutting the pizza into diagonal slices");
+    }
+
+    internal virtual void Box() {
+        Console.WriteLine("Place pizza in official PizzaStore box");
+    }
+}
+
+public class NYStyleCheesePizza() : Pizza("NY Style Sauce and Cheese Pizza", "Thin Crust Dough", "Marinara Sauce",
+    ["Grated Reggiano Cheese"]);
+
+public class ChicagoStyleCheesePizza() : Pizza("Chicago Style Deep Dish Cheese Pizza", "Extra Thick Crust Dough",
+    "Plum Tomato Sauce", ["Shredded Mozzarella Cheese"]) {
+    internal override void Cut() {
+        Console.WriteLine("Cutting the pizza into square slices");
+    }
+}
+
+public abstract class PizzaStore {
+    protected abstract Pizza CreatePizza(string type);
+
+    public Pizza OrderPizza(string type) {
+        var pizza = CreatePizza(type);
+        pizza.Prepare();
+        pizza.Bake();
+        pizza.Cut();
+        pizza.Box();
+        return pizza;
+    }
+}
+
+public class NYPizzaStore : PizzaStore {
+    protected override Pizza CreatePizza(string type) {
+        return type switch {
+            "cheese" => new NYStyleCheesePizza(),
+            _ => throw new ArgumentOutOfRangeException(nameof(type), type, null)
+        };
+    }
+}
+
+public class ChicagoPizzaStore : PizzaStore {
+    protected override Pizza CreatePizza(string type) {
+        return type switch {
+            "cheese" => new ChicagoStyleCheesePizza(),
+            _ => throw new ArgumentOutOfRangeException(nameof(type), type, null)
+        };
+    }
+}
\ No newline at end of file
diff --git a/Ch4PizzaStore/Program.cs b/Ch4PizzaStore/Program.cs
new file mode 100644
index 0000000..5ff470a
--- /dev/null
+++ b/Ch4PizzaStore/Program.cs
@@ -0,0 +1,11 @@
+// See https://aka.ms/new-console-template for more information
+
+using Ch4PizzaStore;
+
+PizzaStore nyStore = new NYPizzaStore();
+PizzaStore chicagoStore = new ChicagoPizzaStore();
+
+var pizza = nyStore.OrderPizza("cheese");
+Console.WriteLine($"Ethan ordered a {pizza.Name}\n");
+pizza = chicagoStore.OrderPizza("cheese");
+Console.WriteLine($"Joel ordered a {pizza.Name}\n");
\ No newline at end of file
diff --git a/HeadFirstDesignPatterns.sln b/HeadFirstDesignPatterns.sln
index 6532c04..14485aa 100644
--- a/HeadFirstDesignPatterns.sln
+++ b/HeadFirstDesignPatterns.sln
@@ -6,6 +6,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ch2Weather", "Ch2Weather\Ch
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ch3Beverage", "Ch3Beverage\Ch3Beverage.csproj", "{8F380143-DDBC-4785-B4F2-7B32EBE54515}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Ch4PizzaStore", "Ch4PizzaStore\Ch4PizzaStore.csproj", "{EECD03A1-DE37-4E1B-8487-0A6DE21FBDB3}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -24,5 +26,9 @@ Global
 		{8F380143-DDBC-4785-B4F2-7B32EBE54515}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{8F380143-DDBC-4785-B4F2-7B32EBE54515}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{8F380143-DDBC-4785-B4F2-7B32EBE54515}.Release|Any CPU.Build.0 = Release|Any CPU
+		{EECD03A1-DE37-4E1B-8487-0A6DE21FBDB3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{EECD03A1-DE37-4E1B-8487-0A6DE21FBDB3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{EECD03A1-DE37-4E1B-8487-0A6DE21FBDB3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{EECD03A1-DE37-4E1B-8487-0A6DE21FBDB3}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal
diff --git a/HeadFirstDesignPatterns.sln.DotSettings b/HeadFirstDesignPatterns.sln.DotSettings
new file mode 100644
index 0000000..5d3463e
--- /dev/null
+++ b/HeadFirstDesignPatterns.sln.DotSettings
@@ -0,0 +1,2 @@
+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=NY/@EntryIndexedValue">NY</s:String></wpf:ResourceDictionary>
\ No newline at end of file