diff --git a/KAOS/KAOS.csproj b/KAOS/KAOS.csproj
index 7a8a2d9..666836d 100644
--- a/KAOS/KAOS.csproj
+++ b/KAOS/KAOS.csproj
@@ -1,273 +1,81 @@
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-<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
-  <PropertyGroup>
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-    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
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-    <Reference Include="Microsoft.CSharp" />
-    <Reference Include="System.Data" />
-    <Reference Include="System.Xml" />
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-  <ItemGroup>
-    <Compile Include="Interfaces\IGameObject.cs" />
-    <Compile Include="Managers\VertexBufferManager.cs" />
-    <Compile Include="Interfaces\IDrawableShape.cs" />
-    <Compile Include="Managers\InputManager.cs" />
-    <Compile Include="Managers\ShaderManager.cs" />
-    <Compile Include="Managers\StateManager.cs" />
-    <Compile Include="Managers\TextureManager.cs" />
-    <Compile Include="Nodes\GraphLinesNode.cs" />
-    <Compile Include="Nodes\PolygonNode.cs" />
-    <Compile Include="Shapes\Capsule.cs">
-      <SubType>Code</SubType>
-    </Compile>
-    <Compile Include="Shapes\ChamferCube.cs">
-      <SubType>Code</SubType>
-    </Compile>
-    <Compile Include="Shapes\KochTetrahedron.cs">
-      <SubType>Code</SubType>
-    </Compile>
-    <Compile Include="Shapes\MengerSponge.cs">
-      <SubType>Code</SubType>
-    </Compile>
-    <Compile Include="Shapes\Old\IsoSphere.cs">
-      <SubType>Code</SubType>
-    </Compile>
-    <Compile Include="Shapes\Old\Plane.cs">
-      <SubType>Code</SubType>
-    </Compile>
-    <Compile Include="Shapes\Old\Shape.cs">
-      <SubType>Code</SubType>
-    </Compile>
-    <Compile Include="Shapes\Old\SierpinskiTetrahedron.cs">
-      <SubType>Code</SubType>
-    </Compile>
-    <Compile Include="Shapes\SlicedHose.cs">
-      <SubType>Code</SubType>
-    </Compile>
-    <Compile Include="Shapes\SlicedSphere.cs">
-      <SubType>Code</SubType>
-    </Compile>
-    <Compile Include="Shapes\TorusKnot.cs">
-      <SubType>Code</SubType>
-    </Compile>
-    <Compile Include="Shapes\VertexPositionColor.cs">
-      <SubType>Code</SubType>
-    </Compile>
-    <Compile Include="States\AbstractState.cs" />
-    <Compile Include="States\MandelbrotState.cs" />
-    <Compile Include="States\ModelState.cs" />
-    <Compile Include="States\SceneGraphState.cs" />
-    <Compile Include="States\Skyboxstate.cs" />
-    <Compile Include="States\VoxelState.cs" />
-    <Compile Include="Utilities\VertexBuffer.cs" />
-    <Compile Include="Utilities\Camera.cs" />
-    <Compile Include="Utilities\Extensions.cs" />
-    <Compile Include="Utilities\Logger.cs" />
-    <Compile Include="Nodes\GroupNode.cs" />
-    <Compile Include="Interfaces\IGroupNode.cs" />
-    <Compile Include="Interfaces\ISceneNode.cs" />
-    <Compile Include="KAOSEngine.cs" />
-    <Compile Include="Shapes\Base\DrawableShape.cs" />
-    <Compile Include="Shapes\Base\VertexStructs.cs" />
-    <Compile Include="Shapes\Helpers\Chunk.cs" />
-    <Compile Include="Shapes\Helpers\MengerCube.cs" />
-    <Compile Include="Shapes\Helpers\TetrahedronFace.cs" />
-    <Compile Include="Shapes\Helpers\VboShape.cs" />
-    <Compile Include="Shapes\Old\Cube.cs" />
-    <Compile Include="Nodes\Node.cs" />
-    <Compile Include="Properties\AssemblyInfo.cs" />
-    <Compile Include="Utilities\AnimationTimer.cs" />
-    <Compile Include="Utilities\Renderer.cs" />
-    <Compile Include="Utilities\Shader.cs" />
-    <Compile Include="Utilities\TextRenderer.cs" />
-    <Compile Include="Utilities\Texture.cs" />
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-    </PreBuildEvent>
-  </PropertyGroup>
-  <PropertyGroup>
-    <PostBuildEvent>
-    </PostBuildEvent>
-  </PropertyGroup>
-  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
-       Other similar extension points exist, see Microsoft.Common.targets.
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\ No newline at end of file
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <UseWindowsForms>true</UseWindowsForms>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>disable</Nullable>
+    <AssemblyName>KAOS</AssemblyName>
+    <RootNamespace>KAOS</RootNamespace>
+    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
+    <EnableDefaultItems>false</EnableDefaultItems>
+    <PlatformTarget>AnyCPU</PlatformTarget>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="OpenTK" Version="4.8.2" />
+    <PackageReference Include="OpenTK.GLControl" Version="4.8.2" />
+    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="AssimpNet" Version="5.0.0-beta1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Reference Include="MataliPhysics">
+      <HintPath>..\Dependencies\MataliPhysicsBasic\MataliPhysicsOpenTK\Mono\MataliPhysics\AnyCPU\MataliPhysics.dll</HintPath>
+    </Reference>
+    <Reference Include="MataliRender">
+      <HintPath>..\Dependencies\MataliPhysicsBasic\MataliPhysicsOpenTK\Mono\MataliPhysics\AnyCPU\MataliRender.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <Compile Include="Interfaces\IGameObject.cs" />
+    <Compile Include="Managers\VertexBufferManager.cs" />
+    <Compile Include="Interfaces\IDrawableShape.cs" />
+    <Compile Include="Managers\InputManager.cs" />
+    <Compile Include="Managers\ShaderManager.cs" />
+    <Compile Include="Managers\StateManager.cs" />
+    <Compile Include="Managers\TextureManager.cs" />
+    <Compile Include="Nodes\GraphLinesNode.cs" />
+    <Compile Include="Nodes\PolygonNode.cs" />
+    <Compile Include="Shapes\Capsule.cs" />
+    <Compile Include="Shapes\ChamferCube.cs" />
+    <Compile Include="Shapes\KochTetrahedron.cs" />
+    <Compile Include="Shapes\MengerSponge.cs" />
+    <Compile Include="Shapes\Old\IsoSphere.cs" />
+    <Compile Include="Shapes\Old\Plane.cs" />
+    <Compile Include="Shapes\Old\Shape.cs" />
+    <Compile Include="Shapes\Old\SierpinskiTetrahedron.cs" />
+    <Compile Include="Shapes\SlicedHose.cs" />
+    <Compile Include="Shapes\SlicedSphere.cs" />
+    <Compile Include="Shapes\TorusKnot.cs" />
+    <Compile Include="Shapes\VertexPositionColor.cs" />
+    <Compile Include="States\AbstractState.cs" />
+    <Compile Include="States\MandelbrotState.cs" />
+    <Compile Include="States\ModelState.cs" />
+    <Compile Include="States\SceneGraphState.cs" />
+    <Compile Include="States\Skyboxstate.cs" />
+    <Compile Include="States\VoxelState.cs" />
+    <Compile Include="Utilities\VertexBuffer.cs" />
+    <Compile Include="Utilities\Camera.cs" />
+    <Compile Include="Utilities\Extensions.cs" />
+    <Compile Include="Utilities\Logger.cs" />
+    <Compile Include="Nodes\GroupNode.cs" />
+    <Compile Include="Interfaces\IGroupNode.cs" />
+    <Compile Include="Interfaces\ISceneNode.cs" />
+    <Compile Include="KAOSEngine.cs" />
+    <Compile Include="Shapes\Base\DrawableShape.cs" />
+    <Compile Include="Shapes\Base\VertexStructs.cs" />
+    <Compile Include="Shapes\Helpers\Chunk.cs" />
+    <Compile Include="Shapes\Helpers\MengerCube.cs" />
+    <Compile Include="Shapes\Helpers\TetrahedronFace.cs" />
+    <Compile Include="Shapes\Helpers\VboShape.cs" />
+    <Compile Include="Shapes\Old\Cube.cs" />
+    <Compile Include="Nodes\Node.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Utilities\AnimationTimer.cs" />
+    <Compile Include="Utilities\Renderer.cs" />
+    <Compile Include="Utilities\Shader.cs" />
+    <Compile Include="Utilities\TextRenderer.cs" />
+    <Compile Include="Utilities\Texture.cs" />
+  </ItemGroup>
+</Project>
diff --git a/KAOS/OpenTK4-MIGRATION.md b/KAOS/OpenTK4-MIGRATION.md
new file mode 100644
index 0000000..f1cd011
--- /dev/null
+++ b/KAOS/OpenTK4-MIGRATION.md
@@ -0,0 +1,27 @@
+# OpenTK 4 Migration Notes
+
+This repository has been moved off the legacy OpenTK 1.x package and onto OpenTK 4 package references at the project level.
+
+## What changed
+
+- `KAOS.csproj` was upgraded from a legacy .NET Framework-style MSBuild project to SDK-style.
+- Target framework was modernized to `net8.0-windows` to support current runtime/tooling.
+- OpenTK package references were upgraded to:
+  - `OpenTK` 4.8.2
+  - `OpenTK.GLControl` 4.8.2
+- Legacy `packages.config` style dependencies were replaced with `PackageReference`.
+- NUnit and AssimpNet dependencies were upgraded to maintained package versions.
+
+## Next migration steps
+
+The runtime code currently uses legacy OpenTK namespaces and APIs (e.g. `OpenTK.Input`, `OpenTK.GameWindow` constructor signatures, and old event args). To fully complete OpenTK 4 migration, update in this order:
+
+1. `KAOSEngine` inheritance and constructors to `OpenTK.Windowing.Desktop.GameWindow` with `GameWindowSettings`/`NativeWindowSettings`.
+2. Input manager and keyboard/mouse usage to `OpenTK.Windowing.GraphicsLibraryFramework.Keys` and new input event model.
+3. Math types to `OpenTK.Mathematics` where needed.
+4. GL compatibility calls (fixed-function matrix stack) to modern shader-uniform matrix flow where required.
+5. Any Editor/Game projects that directly reference old OpenTK APIs.
+
+## Scope choice
+
+This commit prioritizes project-system modernization first to make the source tree OpenTK 4-capable for iterative code migration.