diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9a2a42a..cc82bd3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,39 +1,23 @@
-cmake_minimum_required(VERSION 3.28)
+cmake_minimum_required(VERSION 3.15)
 project(Prog3B)
-set(EXECUTABLE_NAME Prog3B)
-set(OS_NAME windows)
 
-# Generate compile_commands.json
-set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
-set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD 17)
 
-# Set the default build type if not specified
-if(NOT CMAKE_BUILD_TYPE)
-    set(CMAKE_BUILD_TYPE Release CACHE STRING "Build type" FORCE)
-endif()
+include(FetchContent)
 
-set(SRC_FILES
-        ${CMAKE_CURRENT_LIST_DIR}/main.cpp
-        ${CMAKE_CURRENT_LIST_DIR}/gamecube.cpp
+FetchContent_Declare(
+        raylib
+        GIT_REPOSITORY https://github.com/raysan5/raylib.git
+        GIT_TAG 5.0
 )
 
-set(INCLUDE_DIRS
-        ${CMAKE_CURRENT_LIST_DIR}/linux
+FetchContent_MakeAvailable(raylib)
+
+add_executable(Prog3B
+        main.cpp
+        gamecube.cpp
+        gamematrix.cpp
 )
 
-add_executable(${EXECUTABLE_NAME} ${SRC_FILES})
-target_include_directories(${EXECUTABLE_NAME} PRIVATE ${INCLUDE_DIRS})
-target_link_libraries(${EXECUTABLE_NAME} PRIVATE
-        ${CMAKE_CURRENT_LIST_DIR}/${OS_NAME}/libgamematrix.a
-        ${CMAKE_CURRENT_LIST_DIR}/${OS_NAME}/libraylib.a
-)
-if (WIN32)
-    target_link_libraries(Prog3B PRIVATE winmm)
-endif()
-
-# Checks if OSX and links appropriate frameworks (Only required on MacOS)
-if (APPLE)
-    target_link_libraries(Prog3B "-framework IOKit")
-    target_link_libraries(Prog3B "-framework Cocoa")
-    target_link_libraries(Prog3B "-framework OpenGL")
-endif()
+target_include_directories(Prog3B PRIVATE .)
+target_link_libraries(Prog3B raylib)
\ No newline at end of file
diff --git a/gamecube.cpp b/gamecube.cpp
index 6848d50..80e75c5 100644
--- a/gamecube.cpp
+++ b/gamecube.cpp
@@ -27,8 +27,8 @@ void gamecube::Update(float flipSpeed)
     }
 }
 
-void gamecube::FlipForward()   { flippingForward = true; }
-void gamecube::FlipBackward()  { flippingBackward = true; }
+void gamecube::FlipForward() { flippingForward = true; }
+void gamecube::FlipBackward() { flippingBackward = true; }
 
 bool gamecube::IsFlipped() const { return flipped; }
 bool gamecube::IsMatched() const { return matched; }
@@ -38,18 +38,15 @@ void gamecube::Draw() const
 {
     rlPushMatrix();
 
-    // Matrizen für Rotation und Translation erzeugen
     auto matrix_a = gameMatrix::translate({ position.x, position.y, position.z});
     auto matrix_b = gameMatrix::rot3D(rotation, 'y');
-
-    // Matrizen multiplizieren (Translation * Rotation)
     auto model = gameMatrix::matmul(matrix_a, matrix_b);
 
-    // transform for raylib matrix
     float f[16];
     for (int i = 0; i < 4; i++)
         for (int j = 0; j < 4; j++)
             f[j * 4 + i] = model[i][j];
+
     rlMultMatrixf(f);
 
     if (rotation < 90.0f)
@@ -62,5 +59,5 @@ void gamecube::Draw() const
     rlPopMatrix();
 }
 
-Vec3 gamecube::GetPosition() const     { return position; }
-float gamecube::GetRotationY() const   { return rotation; }
\ No newline at end of file
+Vec3 gamecube::GetPosition() const { return position; }
+float gamecube::GetRotationY() const { return rotation; }
diff --git a/gamecube.h b/gamecube.h
index bbe0028..1e5b37b 100644
--- a/gamecube.h
+++ b/gamecube.h
@@ -3,22 +3,24 @@
 #include "raylib.h"
 #include <rlgl.h>
 
-struct Vec3
-{
+struct Vec3 {
     float x, y, z;
 };
 
-class gamecube
-{
+class gamecube {
 public:
     gamecube(const Vec3 &pos, Color col);
+
     void Update(float flipSpeed);
     void FlipForward();
     void FlipBackward();
+
     bool IsFlipped() const;
     bool IsMatched() const;
     void SetMatched(bool m);
+
     void Draw() const;
+
     Vec3 GetPosition() const;
     float GetRotationY() const;
     Color GetColor() const { return color; }
@@ -26,9 +28,12 @@ public:
 private:
     Vec3 position;
     Color color;
+
     bool flipped = false;
     bool matched = false;
+
     bool flippingForward = false;
     bool flippingBackward = false;
+
     float rotation = 0.0f;
-};
\ No newline at end of file
+};
diff --git a/gamematrix.cpp b/gamematrix.cpp
new file mode 100644
index 0000000..ffe8b12
--- /dev/null
+++ b/gamematrix.cpp
@@ -0,0 +1,43 @@
+#include "gamematrix.h"
+
+std::array<std::array<double,4>,4> gameMatrix::matmul(
+    const std::array<std::array<double,4>,4>& A,
+    const std::array<std::array<double,4>,4>& B)
+{
+    std::array<std::array<double,4>,4> R = {};
+
+    for(int i=0;i<4;i++)
+        for(int j=0;j<4;j++)
+            for(int k=0;k<4;k++)
+                R[i][j] += A[i][k] * B[k][j];
+
+    return R;
+}
+
+std::array<std::array<double,4>,4> gameMatrix::rot3D(double angle_deg, char axis)
+{
+    double a = angle_deg * M_PI / 180.0;
+    double c = cos(a);
+    double s = sin(a);
+
+    std::array<std::array<double,4>,4> M = {0};
+
+    M[3][3] = 1;
+    M[axis == 'x'][axis == 'y'] = 1; // init identity axis
+
+    if(axis == 'x') M = {{{1,0,0,0},{0,c,-s,0},{0,s,c,0},{0,0,0,1}}};
+    if(axis == 'y') M = {{{c,0,s,0},{0,1,0,0},{-s,0,c,0},{0,0,0,1}}};
+    if(axis == 'z') M = {{{c,-s,0,0},{s,c,0,0},{0,0,1,0},{0,0,0,1}}};
+
+    return M;
+}
+
+std::array<std::array<double,4>,4> gameMatrix::translate(const std::array<double,3>& p)
+{
+    return {{
+        {1,0,0,p[0]},
+        {0,1,0,p[1]},
+        {0,0,1,p[2]},
+        {0,0,0,1}
+    }};
+}
diff --git a/tests.cpp b/tests.cpp
new file mode 100644
index 0000000..491de37
--- /dev/null
+++ b/tests.cpp
@@ -0,0 +1,22 @@
+#include <iostream>
+#include "gamematrix.h"
+using namespace Matrix3D;
+
+void test_rotation_z() {
+    Vec3 v{1,0,0};
+    auto R = rot3D(90,'z');
+    Vec3 res = apply(R,v);
+    std::cout << "Rotate Z 90° -> (" << res.x << "," << res.y << "," << res.z << ")\n";
+}
+
+void test_translate() {
+    Vec3 v{0,0,0};
+    auto T = translate({1,2,3});
+    Vec3 res = apply(T,v);
+    std::cout << "Translate -> (" << res.x << "," << res.y << "," << res.z << ")\n";
+}
+
+int main() {
+    test_rotation_z();
+    test_translate();
+}