diff --git a/.idea/.idea.AdventOfCode2024/.idea/indexLayout.xml b/.idea/.idea.AdventOfCode2024/.idea/indexLayout.xml
index 9d87670..0d1694e 100644
--- a/.idea/.idea.AdventOfCode2024/.idea/indexLayout.xml
+++ b/.idea/.idea.AdventOfCode2024/.idea/indexLayout.xml
@@ -13,6 +13,8 @@
       <Path>05/PROBLEM.md</Path>
       <Path>06</Path>
       <Path>08</Path>
+      <Path>09/INPUT.txt</Path>
+      <Path>09/PROBLEM.md</Path>
       <Path>10</Path>
       <Path>README.md</Path>
     </explicitIncludes>
diff --git a/11/PlutonianPebbles.Tests/PlutonianPebbles.Tests.csproj b/11/PlutonianPebbles.Tests/PlutonianPebbles.Tests.csproj
new file mode 100644
index 0000000..514f85b
--- /dev/null
+++ b/11/PlutonianPebbles.Tests/PlutonianPebbles.Tests.csproj
@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <NoWarn>CA1822</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\PlutonianPebbles\PlutonianPebbles.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="TUnit" Version="0.4.99" />
+  </ItemGroup>
+
+</Project>
diff --git a/11/PlutonianPebbles/PlutonianPebbles.csproj b/11/PlutonianPebbles/PlutonianPebbles.csproj
new file mode 100644
index 0000000..e7fac23
--- /dev/null
+++ b/11/PlutonianPebbles/PlutonianPebbles.csproj
@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <NoWarn>CA1822</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <InternalsVisibleTo Include="$(AssemblyName).Tests" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Include="..\INPUT.txt">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+  
+</Project>
diff --git a/11/PlutonianPebbles/Program.cs b/11/PlutonianPebbles/Program.cs
new file mode 100644
index 0000000..5f94bf8
--- /dev/null
+++ b/11/PlutonianPebbles/Program.cs
@@ -0,0 +1,24 @@
+using System.Diagnostics;
+
+if (args.Length is 0)
+{
+  Console.WriteLine("Please provide a path to the input file.");
+  return;
+}
+
+if (File.Exists(args[0]) is false)
+{
+  Console.WriteLine("The provided file does not exist.");
+  return;
+}
+
+var isPart2 = args.Length is 2 && args[1] is "part2";
+var input = await File.ReadAllLinesAsync(args[0]);
+
+var stopwatch = new Stopwatch();
+stopwatch.Start();
+
+// TODO: Implement solution
+
+stopwatch.Stop();
+Console.WriteLine($". ({stopwatch.ElapsedMilliseconds}ms)");
\ No newline at end of file
diff --git a/AdventOfCode2024.sln b/AdventOfCode2024.sln
index f66902d..a5701e0 100644
--- a/AdventOfCode2024.sln
+++ b/AdventOfCode2024.sln
@@ -78,6 +78,16 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HoofIt", "10\HoofIt\HoofIt.
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HoofIt.Tests", "10\HoofIt.Tests\HoofIt.Tests.csproj", "{2FACCE14-0E91-4FAA-9105-711A2B4428C3}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "11", "11", "{F2904315-B827-476F-8CDE-99D2EF115F0A}"
+	ProjectSection(SolutionItems) = preProject
+		11\INPUT.txt = 11\INPUT.txt
+		11\PROBLEM.md = 11\PROBLEM.md
+	EndProjectSection
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PlutonianPebbles", "11\PlutonianPebbles\PlutonianPebbles.csproj", "{D5FB6D59-FD68-4186-AE98-585B62EF1E4E}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PlutonianPebbles.Tests", "11\PlutonianPebbles.Tests\PlutonianPebbles.Tests.csproj", "{47276FDB-9A8C-467F-991F-C57AB22DF2B5}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -167,6 +177,14 @@ Global
 		{2FACCE14-0E91-4FAA-9105-711A2B4428C3}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{2FACCE14-0E91-4FAA-9105-711A2B4428C3}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{2FACCE14-0E91-4FAA-9105-711A2B4428C3}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D5FB6D59-FD68-4186-AE98-585B62EF1E4E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D5FB6D59-FD68-4186-AE98-585B62EF1E4E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D5FB6D59-FD68-4186-AE98-585B62EF1E4E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D5FB6D59-FD68-4186-AE98-585B62EF1E4E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{47276FDB-9A8C-467F-991F-C57AB22DF2B5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{47276FDB-9A8C-467F-991F-C57AB22DF2B5}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{47276FDB-9A8C-467F-991F-C57AB22DF2B5}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{47276FDB-9A8C-467F-991F-C57AB22DF2B5}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(NestedProjects) = preSolution
 		{1AFE2FF1-A55D-4D86-A9BB-9875CA0D14D8} = {270B7829-6D23-4B34-91FE-D87D533AF2AB}
@@ -189,5 +207,7 @@ Global
 		{9A7AAC2C-A23B-4FFE-8B2B-93E204904866} = {2971DA3F-AD59-4BE1-A860-4F1B60BCB771}
 		{5C4EC29A-3297-4D53-95EF-80800F3AF68A} = {7AB34145-87D1-4BB5-AF9C-E0239F8BE1DB}
 		{2FACCE14-0E91-4FAA-9105-711A2B4428C3} = {7AB34145-87D1-4BB5-AF9C-E0239F8BE1DB}
+		{D5FB6D59-FD68-4186-AE98-585B62EF1E4E} = {F2904315-B827-476F-8CDE-99D2EF115F0A}
+		{47276FDB-9A8C-467F-991F-C57AB22DF2B5} = {F2904315-B827-476F-8CDE-99D2EF115F0A}
 	EndGlobalSection
 EndGlobal