diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index ef390b4..4ab92d5 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -30,13 +30,14 @@ extern u32 VU1Draw3D_CodeEnd __attribute__((section(".vudata")));
 
 Engine::Engine()
 {
-    SifInitRpc(0);
-    srand(time(NULL));
-    VU1::uploadProgram(0, &VU1Draw3D_CodeStart, &VU1Draw3D_CodeEnd);
-    audio.startThread();
-    isInitialized = 0;
-    isScreenInitialized = 0;
-    mainThreadId = GetThreadId();
+    setDefaultScreen();
+    firePS2();
+}
+
+Engine::Engine(const ScreenSettings &t_screen)
+{
+    screen = t_screen;
+    firePS2();
 }
 
 Engine::~Engine() {}
@@ -45,12 +46,6 @@ Engine::~Engine() {}
 // Methods
 // ----
 
-void Engine::setScreen(ScreenSettings &t_settings)
-{
-    screen = t_settings;
-    isScreenInitialized = true;
-}
-
 void Engine::setDefaultScreen()
 {
     screen.projectionScale = 4096.0F;
@@ -60,13 +55,10 @@ void Engine::setDefaultScreen()
     screen.aspectRatio = 4.0F / 3.0F;
     screen.width = 640.0F;
     screen.height = 480.0F;
-    isScreenInitialized = true;
 }
 
 void Engine::init(Game *t_game, u32 t_gifPacketSize)
 {
-    if (!isScreenInitialized)
-        setDefaultScreen();
     if (isInitialized)
         PRINT_ERR("Already initialized!");
     else
@@ -88,6 +80,16 @@ void Engine::wakeup(s32 t_alarmId, u16 t_time, void *t_common)
     ExitHandler();
 }
 
+void Engine::firePS2()
+{
+    SifInitRpc(0);
+    srand(time(NULL));
+    VU1::uploadProgram(0, &VU1Draw3D_CodeStart, &VU1Draw3D_CodeEnd);
+    audio.startThread();
+    isInitialized = 0;
+    mainThreadId = GetThreadId();
+}
+
 void Engine::gameLoop()
 {
     for (;;)
diff --git a/src/engine/include/engine.hpp b/src/engine/include/engine.hpp
index 184910b..de30139 100644
--- a/src/engine/include/engine.hpp
+++ b/src/engine/include/engine.hpp
@@ -24,12 +24,12 @@ class Engine
 {
 
 public:
+    Engine(const ScreenSettings &screen);
     Engine();
     ~Engine();
 
     void init(Game *t_game, u32 t_gifPacketSize);
     void setDefaultScreen();
-    void setScreen(ScreenSettings &t_settings);
     Renderer *renderer;
     Audio audio;
     ScreenSettings screen;
@@ -37,9 +37,10 @@ public:
     float fps;
 
 private:
+    void firePS2();
     u8 fpsDelayer;
     Timer timer;
-    u8 isInitialized, isScreenInitialized;
+    u8 isInitialized;
     void gameLoop();
     Game *game;
     s32 mainThreadId;
diff --git a/src/engine/include/models/math/matrix.hpp b/src/engine/include/models/math/matrix.hpp
index bf86ddb..366794b 100644
--- a/src/engine/include/models/math/matrix.hpp
+++ b/src/engine/include/models/math/matrix.hpp
@@ -35,7 +35,7 @@ public:
     void makeZRotation(float t_radians);
     void translate(float t_x, float t_y, float t_z);
     void setPerspective(ScreenSettings &screen);
-    void print();
+    const void print() const;
 };
 
 #endif
diff --git a/src/engine/include/models/math/plane.hpp b/src/engine/include/models/math/plane.hpp
index ae7be0c..c5cbf61 100644
--- a/src/engine/include/models/math/plane.hpp
+++ b/src/engine/include/models/math/plane.hpp
@@ -27,7 +27,7 @@ public:
 
     void update(Vector3 &a, Vector3 &b, Vector3 &c);
     inline float distanceTo(Vector3 &t_vec) { return this->distance + this->normal.innerProduct(t_vec); }
-    void print();
+    const void print() const;
 };
 
 #endif
diff --git a/src/engine/include/models/math/point.hpp b/src/engine/include/models/math/point.hpp
index 8f7548d..3ef83a9 100644
--- a/src/engine/include/models/math/point.hpp
+++ b/src/engine/include/models/math/point.hpp
@@ -33,7 +33,7 @@ public:
 
     void set(const float &t_x, const float &t_y);
     void set(const Point &v);
-    void print();
+    const void print() const;
 };
 
 #endif
diff --git a/src/engine/include/models/math/vector3.hpp b/src/engine/include/models/math/vector3.hpp
index 9351ad9..67f5349 100644
--- a/src/engine/include/models/math/vector3.hpp
+++ b/src/engine/include/models/math/vector3.hpp
@@ -54,7 +54,7 @@ public:
     void set(const float &x, const float &y, const float &z);
     void copy(Vector3 &v);
     float distanceTo(Vector3 &v);
-    void print();
+    const void print() const;
 };
 
 #endif
diff --git a/src/engine/include/models/screen_settings.hpp b/src/engine/include/models/screen_settings.hpp
index b0d1f11..8794799 100644
--- a/src/engine/include/models/screen_settings.hpp
+++ b/src/engine/include/models/screen_settings.hpp
@@ -21,7 +21,6 @@ struct ScreenSettings
     float aspectRatio;
     float nearPlaneDist;
     float farPlaneDist;
-    /** change it to 4096.0F to check out frustum culling! 😎 */
     float projectionScale;
 };
 
diff --git a/src/engine/models/math/matrix.cpp b/src/engine/models/math/matrix.cpp
index 1113ff1..7aaaf37 100644
--- a/src/engine/models/math/matrix.cpp
+++ b/src/engine/models/math/matrix.cpp
@@ -187,8 +187,8 @@ void Matrix::setPerspective(ScreenSettings &t_screen)
 {
     float fovYdiv2 = Math::HALF_ANG2RAD * t_screen.fov;
     float cotFOV = 1.0F / (Math::sin(fovYdiv2) / Math::cos(fovYdiv2));
-    float w = cotFOV * (t_screen.width / 4096.0F) / t_screen.aspectRatio;
-    float h = cotFOV * (t_screen.height / 4096.0F);
+    float w = cotFOV * (t_screen.width / t_screen.projectionScale) / t_screen.aspectRatio;
+    float h = cotFOV * (t_screen.height / t_screen.projectionScale);
 
     this->data[0] = w;
     this->data[1] = 0.0F;
@@ -253,7 +253,7 @@ void Matrix::lookAt(Vector3 &t_up, Vector3 &t_position, Vector3 &t_target)
     data[15] = 1;
 }
 
-void Matrix::print()
+const void Matrix::print() const
 {
     printf("MATRIX(\n%f, %f, %f, %f\n%f, %f, %f, %f\n%f, %f, %f, %f\n%f, %f, %f, %f\n)\n",
            data[0], data[1], data[2], data[3],
diff --git a/src/engine/models/math/plane.cpp b/src/engine/models/math/plane.cpp
index b51453e..bf3394c 100644
--- a/src/engine/models/math/plane.cpp
+++ b/src/engine/models/math/plane.cpp
@@ -44,7 +44,7 @@ void Plane::update(Vector3 &a, Vector3 &b, Vector3 &c)
     this->distance = -this->normal.innerProduct(b);
 }
 
-void Plane::print()
+const void Plane::print() const
 {
     printf("Plane(Vector3(%f, %f, %f), %f)\n", this->normal.x, this->normal.y, this->normal.z, this->distance);
 }
diff --git a/src/engine/models/math/point.cpp b/src/engine/models/math/point.cpp
index 3215175..ef6caa5 100644
--- a/src/engine/models/math/point.cpp
+++ b/src/engine/models/math/point.cpp
@@ -55,7 +55,7 @@ void Point::set(const Point &v)
     y = v.y;
 }
 
-void Point::print()
+const void Point::print() const
 {
     printf("Point(%f, %f)\n", x, y);
 }
diff --git a/src/engine/models/math/vector3.cpp b/src/engine/models/math/vector3.cpp
index b1a4712..eeae3ee 100644
--- a/src/engine/models/math/vector3.cpp
+++ b/src/engine/models/math/vector3.cpp
@@ -295,7 +295,7 @@ float Vector3::distanceTo(Vector3 &v)
     //                   (this->z - another.z) * (this->z - another.z));
 }
 
-void Vector3::print()
+const void Vector3::print() const
 {
     printf("Vector3(%f, %f, %f)\n", x, y, z);
 }
diff --git a/src/engine/models/mesh_material.cpp b/src/engine/models/mesh_material.cpp
index 67379f5..f435ce6 100644
--- a/src/engine/models/mesh_material.cpp
+++ b/src/engine/models/mesh_material.cpp
@@ -71,14 +71,15 @@ u8 MeshMaterial::isInFrustum(Plane *t_frustumPlanes, const Vector3 &position)
 {
     Vector3 boxCalcTemp;
     u8 boxResult = 1, boxIn = 0, boxOut = 0;
-    for (int i = 0; i < 6; i++)
+
+    for (u8 i = 0; i < 6; i++)
     {
         boxOut = 0;
         boxIn = 0;
         // for each corner of the box do ...
         // get out of the cycle as soon as a box as corners
         // both inside and out of the frustum
-        for (int y = 0; y < 8 && (boxIn == 0 || boxOut == 0); y++)
+        for (u8 y = 0; y < 8 && (boxIn == 0 || boxOut == 0); y++)
         {
             boxCalcTemp.set(
                 boundingBox[y].x + position.x,
diff --git a/src/samples/ari/ari.cpp b/src/samples/ari/ari.cpp
index 000688c..767c1de 100644
--- a/src/samples/ari/ari.cpp
+++ b/src/samples/ari/ari.cpp
@@ -18,7 +18,7 @@
 
 const u8 WATER_TILES_COUNT = 64;
 
-Ari::Ari(const Engine &t_engine) : engine(t_engine), camera(&engine.screen)
+Ari::Ari(Engine *t_engine) : engine(t_engine), camera(&engine->screen)
 {
     waterFloors = new Mesh[WATER_TILES_COUNT];
     spirals = new Point[WATER_TILES_COUNT];
@@ -33,13 +33,13 @@ Ari::~Ari() {}
 void Ari::onInit()
 {
 
-    engine.renderer->setCameraDefinitions(&camera.worldView, &camera.unitCirclePosition, camera.planes);
-    engine.audio.init(0);
-    engine.audio.setVolume(40);
-    engine.audio.loadSong("MOV-CIRC.WAV");
-    engine.audio.play();
+    engine->renderer->setCameraDefinitions(&camera.worldView, &camera.unitCirclePosition, camera.planes);
+    engine->audio.init(0);
+    engine->audio.setVolume(40);
+    engine->audio.loadSong("MOV-CIRC.WAV");
+    engine->audio.play();
 
-    texRepo = engine.renderer->getTextureRepository();
+    texRepo = engine->renderer->getTextureRepository();
 
     island.loadDff("sunnyisl/", "sunnyisl", 0.1F, false);
     island.rotation.x = -1.6F;
@@ -86,15 +86,15 @@ void Ari::initBulb()
 
 void Ari::onUpdate()
 {
-    if (engine.pad.isCrossClicked)
-        printf("FPS:%f\n", engine.fps);
-    camera.update(engine.pad, player.mesh);
-    engine.renderer->draw(skybox);
-    engine.renderer->draw(island);
-    engine.renderer->draw(islandAddons);
-    engine.renderer->draw(player.mesh);
+    if (engine->pad.isCrossClicked)
+        printf("FPS:%f\n", engine->fps);
+    camera.update(engine->pad, player.mesh);
+    engine->renderer->draw(skybox);
+    engine->renderer->draw(island);
+    engine->renderer->draw(islandAddons);
+    engine->renderer->draw(player.mesh);
     for (u8 i = 0; i < WATER_TILES_COUNT; i++)
-        engine.renderer->draw(waterFloors[i]);
+        engine->renderer->draw(waterFloors[i]);
 }
 
 void Ari::calcSpiral(int X, int Y)
diff --git a/src/samples/ari/ari.hpp b/src/samples/ari/ari.hpp
index 2da0636..9f86c1f 100644
--- a/src/samples/ari/ari.hpp
+++ b/src/samples/ari/ari.hpp
@@ -23,13 +23,13 @@ class Ari : public Game
 {
 
 public:
-    Ari(const Engine &t_engine);
+    Ari(Engine *t_engine);
     ~Ari();
 
     void onInit();
     void onUpdate();
 
-    Engine engine;
+    Engine *engine;
 
 private:
     void initBulb();
diff --git a/src/samples/ari/main.cpp b/src/samples/ari/main.cpp
index 1a3d027..e8bd95a 100644
--- a/src/samples/ari/main.cpp
+++ b/src/samples/ari/main.cpp
@@ -13,8 +13,8 @@
 int main()
 {
     Engine engine = Engine();
-    Ari game = Ari(engine);
-    game.engine.init(&game, 40000);
+    Ari game = Ari(&engine);
+    game.engine->init(&game, 40000);
     SleepThread();
     return 0;
 }
diff --git a/src/samples/floors/floors.cpp b/src/samples/floors/floors.cpp
index c57e15b..c9450d6 100644
--- a/src/samples/floors/floors.cpp
+++ b/src/samples/floors/floors.cpp
@@ -16,8 +16,8 @@
 
 const u8 FLOORS_COUNT = 64; // Temp change it also in floor_manager.hpp
 
-Floors::Floors(const Engine &t_engine)
-    : engine(t_engine), floorManager(FLOORS_COUNT), camera(&engine.screen) {}
+Floors::Floors(Engine *t_engine)
+    : engine(t_engine), floorManager(FLOORS_COUNT), camera(&t_engine->screen) {}
 
 Floors::~Floors() {}
 
@@ -27,13 +27,14 @@ Floors::~Floors() {}
 
 void Floors::onInit()
 {
-    engine.renderer->setCameraDefinitions(&camera.worldView, &camera.unitCirclePosition, camera.planes);
-    engine.audio.init(2);
-    engine.audio.addListener(&floorManager);
-    engine.audio.addListener(&lightManager);
-    engine.audio.loadSong("NF-CHILL.WAV");
-    engine.audio.play();
-    texRepo = engine.renderer->getTextureRepository();
+    engine->renderer->setCameraDefinitions(&camera.worldView, &camera.unitCirclePosition, camera.planes);
+    engine->audio.init(2);
+    engine->audio.addListener(&floorManager);
+    engine->audio.addListener(&lightManager);
+    engine->audio.loadSong("NF-CHILL.WAV");
+    engine->audio.setVolume(1);
+    engine->audio.play();
+    texRepo = engine->renderer->getTextureRepository();
     texRepo->addByMesh("warrior/", player.mesh);
     texRepo->addByMesh("floor/", floorManager.floors[0].mesh);
     for (u32 i = 1; i < floorManager.floorAmount; i++)
@@ -43,13 +44,13 @@ void Floors::onInit()
 
 void Floors::onUpdate()
 {
-    if (engine.pad.isCrossClicked)
-        printf("FPS:%f\n", engine.fps);
+    if (engine->pad.isCrossClicked)
+        printf("FPS:%f\n", engine->fps);
     lightManager.update();
-    camera.update(engine.pad, player.mesh);
+    camera.update(engine->pad, player.mesh);
     floorManager.update(player);
-    player.update(engine.pad, camera, floorManager);
-    engine.renderer->draw(player.mesh);
+    player.update(engine->pad, camera, floorManager);
+    engine->renderer->draw(player.mesh);
     for (u8 i = 0; i < FLOORS_COUNT; i++)
-        engine.renderer->drawByPath3(floorManager.floors[i].mesh, lightManager.bulbs, lightManager.bulbsCount);
+        engine->renderer->drawByPath3(floorManager.floors[i].mesh, lightManager.bulbs, lightManager.bulbsCount);
 }
diff --git a/src/samples/floors/floors.hpp b/src/samples/floors/floors.hpp
index 67bad16..09447fc 100644
--- a/src/samples/floors/floors.hpp
+++ b/src/samples/floors/floors.hpp
@@ -24,13 +24,13 @@ class Floors : public Game
 {
 
 public:
-    Floors(const Engine &t_engine);
+    Floors(Engine *t_engine);
     ~Floors();
 
     void onInit();
     void onUpdate();
 
-    Engine engine;
+    Engine *engine;
 
 private:
     TextureRepository *texRepo;
diff --git a/src/samples/floors/main.cpp b/src/samples/floors/main.cpp
index bc2e3f6..fcbf784 100644
--- a/src/samples/floors/main.cpp
+++ b/src/samples/floors/main.cpp
@@ -13,8 +13,8 @@
 int main()
 {
     Engine engine = Engine();
-    Floors game = Floors(engine);
-    game.engine.init(&game, 40000);
+    Floors game = Floors(&engine);
+    game.engine->init(&game, 40000);
     SleepThread();
     return 0;
 }
diff --git a/src/samples/floors/managers/floor_manager.cpp b/src/samples/floors/managers/floor_manager.cpp
index f491240..3b9cb96 100644
--- a/src/samples/floors/managers/floor_manager.cpp
+++ b/src/samples/floors/managers/floor_manager.cpp
@@ -106,7 +106,6 @@ void FloorManager::update(Player &t_player)
 /** Called by audio thread */
 void FloorManager::onAudioTick()
 {
-    printf("Hit!\n");
     if (audioTick++ > 16)
     {
         if (audioMode == 0)